During an uneven lightning strike, the safest option is to remain inside the car with the windows closed (option A). This is because a car acts as a Faraday cage, which means that it distributes the electric charge around its exterior, effectively protecting the occupants inside. Opening the windowsRead more
During an uneven lightning strike, the safest option is to remain inside the car with the windows closed (option A). This is because a car acts as a Faraday cage, which means that it distributes the electric charge around its exterior, effectively protecting the occupants inside. Opening the windows (option B) can allow lightning to enter the vehicle, increasing the risk of injury. Getting down from the car and sitting down (option C) exposes you directly to lightning and is highly dangerous. Sitting on top of the car (option D) puts you at an even greater risk, as you become the highest point and more likely to be struck. Therefore, staying inside the car with windows closed is the best way to stay safe.
The charging of objects occurs as a result of the transfer of electrons (option A). Electrons are subatomic particles with a negative charge and are located in the outer shells of atoms. When two objects come into contact, electrons can be transferred from one object to another, causing one object tRead more
The charging of objects occurs as a result of the transfer of electrons (option A). Electrons are subatomic particles with a negative charge and are located in the outer shells of atoms. When two objects come into contact, electrons can be transferred from one object to another, causing one object to become positively charged (losing electrons) and the other to become negatively charged (gaining electrons). Positrons (option B) are the antiparticles of electrons and are not involved in typical static electricity scenarios. Protons (option C) are positively charged particles found in the nucleus of an atom and do not move freely to cause charging. Neutrons (option D) are neutral particles also located in the nucleus and do not participate in the charging process. Therefore, the movement of electrons is responsible for the charging of objects.
When an ebonite rod is rubbed with the skin of a cat, the ebonite rod becomes negatively charged (option A). This phenomenon occurs due to the transfer of electrons. Ebonite, being a material that has a strong affinity for electrons, attracts and gains electrons from the cat's skin during the rubbinRead more
When an ebonite rod is rubbed with the skin of a cat, the ebonite rod becomes negatively charged (option A). This phenomenon occurs due to the transfer of electrons. Ebonite, being a material that has a strong affinity for electrons, attracts and gains electrons from the cat’s skin during the rubbing process. As a result, the ebonite rod accumulates an excess of negatively charged electrons, which leads to it becoming negatively charged. The cat’s skin, having lost some of its electrons, becomes positively charged in turn. This transfer of electrons is a classic example of triboelectric charging, where contact and friction between two different materials result in one material gaining electrons and the other losing them. Therefore, the ebonite rod acquires a negative charge after rubbing with the cat’s skin.
Similar charges have repulsion (option C). This fundamental principle of electrostatics states that like charges repel each other. For instance, if two positively charged objects or two negatively charged objects are brought close to each other, they will experience a force that pushes them apart. TRead more
Similar charges have repulsion (option C). This fundamental principle of electrostatics states that like charges repel each other. For instance, if two positively charged objects or two negatively charged objects are brought close to each other, they will experience a force that pushes them apart. This is because similar charges create an electric field that exerts a force on other similar charges, causing them to move away from each other. This repulsive force is described by Coulomb’s Law, which quantifies the magnitude of the force based on the charges’ magnitudes and the distance between them. Attraction (option A) occurs between opposite charges, such as positive and negative. Adhesion (option B) and cohesion (option D) refer to forces that cause molecules to stick together, but are not related to the behavior of electrostatic charges. Therefore, similar charges always exhibit repulsion.
If the distance between two electric charges is halved, the value of the electric force between them will become quadruple (option C). This outcome is based on the principle that the electric force between two charges depends on the distance separating them. When the distance between the charges isRead more
If the distance between two electric charges is halved, the value of the electric force between them will become quadruple (option C). This outcome is based on the principle that the electric force between two charges depends on the distance separating them. When the distance between the charges is reduced by half, the electric force does not merely double; instead, it increases by a factor of four. This is because the relationship between the distance and the force is such that reducing the distance by a certain factor results in the force increasing by the square of that factor. Therefore, when the distance is halved, the force becomes four times stronger, illustrating how sensitive the electric force is to changes in distance.
The force between two electric charges is related to Coulomb's law (option B). Coulomb's law is a fundamental principle in physics that explains the behavior of electrostatic forces between charged particles. It describes how the magnitude of the force between two point charges depends on the amountRead more
The force between two electric charges is related to Coulomb’s law (option B). Coulomb’s law is a fundamental principle in physics that explains the behavior of electrostatic forces between charged particles. It describes how the magnitude of the force between two point charges depends on the amount of charge on each object and the distance separating them. The law highlights that the electric force increases with larger charges and decreases with greater distances. This principle is essential for understanding various electrostatic phenomena, such as the attraction or repulsion between objects and the behavior of electric fields. Coulomb’s law differs from Ampere’s law (option A), which deals with magnetic fields generated by electric currents; Faraday’s law (option C), which relates to electromagnetic induction; and Ohm’s law (option D), which describes the relationship between voltage, current, and resistance in an electrical circuit.
The entire charge of a charged conductor remains on its outer surface (option B). This phenomenon occurs because of the repulsive forces between like charges. When a conductor is charged, the charges redistribute themselves in such a way that they are as far apart as possible to minimize repulsive fRead more
The entire charge of a charged conductor remains on its outer surface (option B). This phenomenon occurs because of the repulsive forces between like charges. When a conductor is charged, the charges redistribute themselves in such a way that they are as far apart as possible to minimize repulsive forces. This results in the charges moving to the outer surface of the conductor, creating an equilibrium state. Inside a conductor, the electric field is zero, so there is no force driving the charges to stay on the inner surface. This principle is fundamental to electrostatics and explains why the charges on a conductor reside entirely on the outer surface. Unlike insulators, where charges can remain stationary, conductors allow for the free movement of charges to achieve this state. Thus, the entire charge of a charged conductor resides on its outer surface.
When a glass rod is rubbed with silk, the rod becomes positively charged (option B). This happens due to the transfer of electrons between the two materials. Glass tends to lose electrons easily, while silk has a higher affinity for electrons. When they are rubbed together, electrons are transferredRead more
When a glass rod is rubbed with silk, the rod becomes positively charged (option B). This happens due to the transfer of electrons between the two materials. Glass tends to lose electrons easily, while silk has a higher affinity for electrons. When they are rubbed together, electrons are transferred from the glass rod to the silk. As a result, the glass rod is left with a deficiency of electrons, which makes it positively charged. The silk, having gained those electrons, becomes negatively charged. This process of charging by friction demonstrates the principle of electron transfer between materials with different tendencies to gain or lose electrons. This transfer creates a static charge on both objects, with the glass rod ending up positively charged due to the loss of electrons.
Light travels slower in glass than in air because the refractive index of air is less than the refractive index of glass (option A). The refractive index is a measure of how much light bends when it enters a material. Air, having a lower refractive index, allows light to travel through it with minimRead more
Light travels slower in glass than in air because the refractive index of air is less than the refractive index of glass (option A). The refractive index is a measure of how much light bends when it enters a material. Air, having a lower refractive index, allows light to travel through it with minimal interaction and minimal slowing down. In contrast, glass has a higher refractive index, meaning light encounters more resistance as it passes through. This resistance occurs because light interacts more with the atoms and molecules in the glass, which absorb and re-emit the light waves, effectively slowing their overall speed. While the density of the materials can influence their refractive properties, the primary reason for the difference in light speed is the refractive index, making light travel slower in glass than in air.
Fiber optic used in communication works only on the principle of total internal reflection of light (option D). Inside an optical fiber, light travels through a core made of a material with a high refractive index surrounded by a cladding with a lower refractive index. When light enters the core atRead more
Fiber optic used in communication works only on the principle of total internal reflection of light (option D). Inside an optical fiber, light travels through a core made of a material with a high refractive index surrounded by a cladding with a lower refractive index. When light enters the core at a certain angle (above the critical angle), it undergoes total internal reflection at the core-cladding interface. This reflection process traps the light within the core, allowing it to travel long distances without significant loss of signal strength. This principle is crucial for transmitting data as pulses of light, enabling high-speed and reliable communication over optical networks. Unlike regular reflection of light (option A) or diffuse reflection of light (option B), which do not maintain the coherence or intensity needed for optical communication, total internal reflection specifically facilitates the efficient transmission of light signals through optical fibers, making it indispensable in modern telecommunications infrastructure.
You are going in a car. If there is going to be an uneven lightning strike, then to stay safe
During an uneven lightning strike, the safest option is to remain inside the car with the windows closed (option A). This is because a car acts as a Faraday cage, which means that it distributes the electric charge around its exterior, effectively protecting the occupants inside. Opening the windowsRead more
During an uneven lightning strike, the safest option is to remain inside the car with the windows closed (option A). This is because a car acts as a Faraday cage, which means that it distributes the electric charge around its exterior, effectively protecting the occupants inside. Opening the windows (option B) can allow lightning to enter the vehicle, increasing the risk of injury. Getting down from the car and sitting down (option C) exposes you directly to lightning and is highly dangerous. Sitting on top of the car (option D) puts you at an even greater risk, as you become the highest point and more likely to be struck. Therefore, staying inside the car with windows closed is the best way to stay safe.
See lessThe charging of objects occurs as a result of the transfer of
The charging of objects occurs as a result of the transfer of electrons (option A). Electrons are subatomic particles with a negative charge and are located in the outer shells of atoms. When two objects come into contact, electrons can be transferred from one object to another, causing one object tRead more
The charging of objects occurs as a result of the transfer of electrons (option A). Electrons are subatomic particles with a negative charge and are located in the outer shells of atoms. When two objects come into contact, electrons can be transferred from one object to another, causing one object to become positively charged (losing electrons) and the other to become negatively charged (gaining electrons). Positrons (option B) are the antiparticles of electrons and are not involved in typical static electricity scenarios. Protons (option C) are positively charged particles found in the nucleus of an atom and do not move freely to cause charging. Neutrons (option D) are neutral particles also located in the nucleus and do not participate in the charging process. Therefore, the movement of electrons is responsible for the charging of objects.
See lessWhen an ebonite rod is rubbed with the skin of a cat, the ebonite rod
When an ebonite rod is rubbed with the skin of a cat, the ebonite rod becomes negatively charged (option A). This phenomenon occurs due to the transfer of electrons. Ebonite, being a material that has a strong affinity for electrons, attracts and gains electrons from the cat's skin during the rubbinRead more
When an ebonite rod is rubbed with the skin of a cat, the ebonite rod becomes negatively charged (option A). This phenomenon occurs due to the transfer of electrons. Ebonite, being a material that has a strong affinity for electrons, attracts and gains electrons from the cat’s skin during the rubbing process. As a result, the ebonite rod accumulates an excess of negatively charged electrons, which leads to it becoming negatively charged. The cat’s skin, having lost some of its electrons, becomes positively charged in turn. This transfer of electrons is a classic example of triboelectric charging, where contact and friction between two different materials result in one material gaining electrons and the other losing them. Therefore, the ebonite rod acquires a negative charge after rubbing with the cat’s skin.
See lessSimilar charges have
Similar charges have repulsion (option C). This fundamental principle of electrostatics states that like charges repel each other. For instance, if two positively charged objects or two negatively charged objects are brought close to each other, they will experience a force that pushes them apart. TRead more
Similar charges have repulsion (option C). This fundamental principle of electrostatics states that like charges repel each other. For instance, if two positively charged objects or two negatively charged objects are brought close to each other, they will experience a force that pushes them apart. This is because similar charges create an electric field that exerts a force on other similar charges, causing them to move away from each other. This repulsive force is described by Coulomb’s Law, which quantifies the magnitude of the force based on the charges’ magnitudes and the distance between them. Attraction (option A) occurs between opposite charges, such as positive and negative. Adhesion (option B) and cohesion (option D) refer to forces that cause molecules to stick together, but are not related to the behavior of electrostatic charges. Therefore, similar charges always exhibit repulsion.
See lessIf the distance between two electric charges is halved, then the value of electric force between them will become
If the distance between two electric charges is halved, the value of the electric force between them will become quadruple (option C). This outcome is based on the principle that the electric force between two charges depends on the distance separating them. When the distance between the charges isRead more
If the distance between two electric charges is halved, the value of the electric force between them will become quadruple (option C). This outcome is based on the principle that the electric force between two charges depends on the distance separating them. When the distance between the charges is reduced by half, the electric force does not merely double; instead, it increases by a factor of four. This is because the relationship between the distance and the force is such that reducing the distance by a certain factor results in the force increasing by the square of that factor. Therefore, when the distance is halved, the force becomes four times stronger, illustrating how sensitive the electric force is to changes in distance.
See lessThe force between two electric charges is related to
The force between two electric charges is related to Coulomb's law (option B). Coulomb's law is a fundamental principle in physics that explains the behavior of electrostatic forces between charged particles. It describes how the magnitude of the force between two point charges depends on the amountRead more
The force between two electric charges is related to Coulomb’s law (option B). Coulomb’s law is a fundamental principle in physics that explains the behavior of electrostatic forces between charged particles. It describes how the magnitude of the force between two point charges depends on the amount of charge on each object and the distance separating them. The law highlights that the electric force increases with larger charges and decreases with greater distances. This principle is essential for understanding various electrostatic phenomena, such as the attraction or repulsion between objects and the behavior of electric fields. Coulomb’s law differs from Ampere’s law (option A), which deals with magnetic fields generated by electric currents; Faraday’s law (option C), which relates to electromagnetic induction; and Ohm’s law (option D), which describes the relationship between voltage, current, and resistance in an electrical circuit.
See lessThe entire charge of a charged conductor
The entire charge of a charged conductor remains on its outer surface (option B). This phenomenon occurs because of the repulsive forces between like charges. When a conductor is charged, the charges redistribute themselves in such a way that they are as far apart as possible to minimize repulsive fRead more
The entire charge of a charged conductor remains on its outer surface (option B). This phenomenon occurs because of the repulsive forces between like charges. When a conductor is charged, the charges redistribute themselves in such a way that they are as far apart as possible to minimize repulsive forces. This results in the charges moving to the outer surface of the conductor, creating an equilibrium state. Inside a conductor, the electric field is zero, so there is no force driving the charges to stay on the inner surface. This principle is fundamental to electrostatics and explains why the charges on a conductor reside entirely on the outer surface. Unlike insulators, where charges can remain stationary, conductors allow for the free movement of charges to achieve this state. Thus, the entire charge of a charged conductor resides on its outer surface.
See lessWhen a glass rod is rubbed with silk, the rod
When a glass rod is rubbed with silk, the rod becomes positively charged (option B). This happens due to the transfer of electrons between the two materials. Glass tends to lose electrons easily, while silk has a higher affinity for electrons. When they are rubbed together, electrons are transferredRead more
When a glass rod is rubbed with silk, the rod becomes positively charged (option B). This happens due to the transfer of electrons between the two materials. Glass tends to lose electrons easily, while silk has a higher affinity for electrons. When they are rubbed together, electrons are transferred from the glass rod to the silk. As a result, the glass rod is left with a deficiency of electrons, which makes it positively charged. The silk, having gained those electrons, becomes negatively charged. This process of charging by friction demonstrates the principle of electron transfer between materials with different tendencies to gain or lose electrons. This transfer creates a static charge on both objects, with the glass rod ending up positively charged due to the loss of electrons.
See lessLight travels slower in glass than in air, because
Light travels slower in glass than in air because the refractive index of air is less than the refractive index of glass (option A). The refractive index is a measure of how much light bends when it enters a material. Air, having a lower refractive index, allows light to travel through it with minimRead more
Light travels slower in glass than in air because the refractive index of air is less than the refractive index of glass (option A). The refractive index is a measure of how much light bends when it enters a material. Air, having a lower refractive index, allows light to travel through it with minimal interaction and minimal slowing down. In contrast, glass has a higher refractive index, meaning light encounters more resistance as it passes through. This resistance occurs because light interacts more with the atoms and molecules in the glass, which absorb and re-emit the light waves, effectively slowing their overall speed. While the density of the materials can influence their refractive properties, the primary reason for the difference in light speed is the refractive index, making light travel slower in glass than in air.
See lessFiber optic used in communication works only on which principle?
Fiber optic used in communication works only on the principle of total internal reflection of light (option D). Inside an optical fiber, light travels through a core made of a material with a high refractive index surrounded by a cladding with a lower refractive index. When light enters the core atRead more
Fiber optic used in communication works only on the principle of total internal reflection of light (option D). Inside an optical fiber, light travels through a core made of a material with a high refractive index surrounded by a cladding with a lower refractive index. When light enters the core at a certain angle (above the critical angle), it undergoes total internal reflection at the core-cladding interface. This reflection process traps the light within the core, allowing it to travel long distances without significant loss of signal strength. This principle is crucial for transmitting data as pulses of light, enabling high-speed and reliable communication over optical networks. Unlike regular reflection of light (option A) or diffuse reflection of light (option B), which do not maintain the coherence or intensity needed for optical communication, total internal reflection specifically facilitates the efficient transmission of light signals through optical fibers, making it indispensable in modern telecommunications infrastructure.
See less