(a) Increase in temperature of water. Evaporation increases with temperature because higher thermal energy allows more water molecules to escape into the air. Increased kinetic energy breaks intermolecular forces, leading to faster evaporation. Other factors, like reduced surface area or adding saltRead more
(a) Increase in temperature of water. Evaporation increases with temperature because higher thermal energy allows more water molecules to escape into the air. Increased kinetic energy breaks intermolecular forces, leading to faster evaporation. Other factors, like reduced surface area or adding salt, decrease evaporation.
The correct answer is (b) 2.5 × 10¹⁸. Using Ohm’s law, I = V/R =200V/100Ω =2A. The charge flow per second is Q = It = 2C. The number of electrons is Q/e = 2/(1.6 × 10⁻¹⁹) = 2.5 ×10¹⁸. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
The correct answer is (b) 2.5 × 10¹⁸. Using Ohm’s law,
I = V/R =200V/100Ω =2A. The charge flow per second is
Q = It = 2C. The number of electrons is
Q/e = 2/(1.6 × 10⁻¹⁹) = 2.5 ×10¹⁸.
(d) Zero. The electric potential due to a dipole at any point on its equatorial line is always zero. This is because the contributions from the positive and negative charges cancel each other out, as they are equidistant from the point and their potentials have equal magnitudes but opposite signs, rRead more
(d) Zero. The electric potential due to a dipole at any point on its equatorial line is always zero. This is because the contributions from the positive and negative charges cancel each other out, as they are equidistant from the point and their potentials have equal magnitudes but opposite signs, resulting in a net potential of zero.
The correct answer is (d) +5e, -8e, +7e. When conductors come in contact, charge redistributes while conserving total charge. The initial total charge is (+3e) + (+5e) + (-3e) = +5e. Among the given options, only (d) +5e, -8e, +7e maintains this total charge, satisfying charge conservation and possiRead more
The correct answer is (d) +5e, -8e, +7e. When conductors come in contact, charge redistributes while conserving total charge. The initial total charge is (+3e) + (+5e) + (-3e) = +5e. Among the given options, only (d) +5e, -8e, +7e maintains this total charge, satisfying charge conservation and possible redistribution after separation.
(b) 35.5 u. Chlorine has two isotopes, ³⁵Cl (75%) and ³⁷Cl (25%), and its atomic mass is the weighted average of these isotopes. The calculation gives (35 × 0.75) + (37 × 0.25) = 35.5 u, making 35.5 u the correct atomic mass. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(b) 35.5 u. Chlorine has two isotopes, ³⁵Cl (75%) and ³⁷Cl (25%), and its atomic mass is the weighted average of these isotopes. The calculation gives (35 × 0.75) + (37 × 0.25) = 35.5 u, making 35.5 u the correct atomic mass.
Gauss’s law states that the total electric flux through a closed surface depends only on the net charge enclosed, not on the field's uniformity. It applies even in non-uniform fields, as the integral form accounts for variations in the electric field at different points. (c) Gauss’s theorem can be aRead more
Gauss’s law states that the total electric flux through a closed surface depends only on the net charge enclosed, not on the field’s uniformity. It applies even in non-uniform fields, as the integral form accounts for variations in the electric field at different points.
(c) Gauss’s theorem can be applied to a non-uniform electric field.
Electric field lines contract longitudinally due to the attractive force between opposite charges, which pulls the field lines together. This contraction represents the tendency of opposite charges to come closer, reducing potential energy and maintaining the natural behavior of electric fields. (a)Read more
Electric field lines contract longitudinally due to the attractive force between opposite charges, which pulls the field lines together. This contraction represents the tendency of opposite charges to come closer, reducing potential energy and maintaining the natural behavior of electric fields.
(a) Attraction between unlike charges.
Gauss’s law states that the total electric flux through a closed surface depends only on the net charge enclosed, not on the field's uniformity. It applies even in non-uniform fields, as the integral form accounts for variations in the electric field at different points. (c) Gauss’s theorem can be aRead more
Gauss’s law states that the total electric flux through a closed surface depends only on the net charge enclosed, not on the field’s uniformity. It applies even in non-uniform fields, as the integral form accounts for variations in the electric field at different points.
(c) Gauss’s theorem can be applied to a non-uniform electric field.
When a body becomes positively charged, it loses electrons, which have a small mass. Since electrons have mass, the body's overall mass slightly decreases during the charging process. However, this mass loss is extremely small and generally negligible. Answer: (a) Loses mass. For more visit here: htRead more
When a body becomes positively charged, it loses electrons, which have a small mass. Since electrons have mass, the body’s overall mass slightly decreases during the charging process. However, this mass loss is extremely small and generally negligible. Answer: (a) Loses mass.
Cereal crops are grasses grown for their edible grains. Millets, sorghum and maize are all cereal crops, while lentil is a pulse crop, not a cereal. Pulses are legumes grown for their protein-rich seeds, whereas cereals primarily provide carbohydrates. Answer: (a) Lentil. https://www.tiwariacademy.cRead more
Cereal crops are grasses grown for their edible grains. Millets, sorghum and maize are all cereal crops, while lentil is a pulse crop, not a cereal. Pulses are legumes grown for their protein-rich seeds, whereas cereals primarily provide carbohydrates. Answer: (a) Lentil.
Which condition out of the following will increase the evaporation of water? (a) Increase in temperature of water (b) Decrease in temperature of water (c) Less exposed surface area of water (d) Adding common salt to water
(a) Increase in temperature of water. Evaporation increases with temperature because higher thermal energy allows more water molecules to escape into the air. Increased kinetic energy breaks intermolecular forces, leading to faster evaporation. Other factors, like reduced surface area or adding saltRead more
(a) Increase in temperature of water. Evaporation increases with temperature because higher thermal energy allows more water molecules to escape into the air. Increased kinetic energy breaks intermolecular forces, leading to faster evaporation. Other factors, like reduced surface area or adding salt, decrease evaporation.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See lessA potential difference of 200 V is maintained across a conductor of resistance 100 Ω The number of electrons passing through it in 1 second is
The correct answer is (b) 2.5 × 10¹⁸. Using Ohm’s law, I = V/R =200V/100Ω =2A. The charge flow per second is Q = It = 2C. The number of electrons is Q/e = 2/(1.6 × 10⁻¹⁹) = 2.5 ×10¹⁸. For more visit here: https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
The correct answer is (b) 2.5 × 10¹⁸. Using Ohm’s law,
I = V/R =200V/100Ω =2A. The charge flow per second is
Q = It = 2C. The number of electrons is
Q/e = 2/(1.6 × 10⁻¹⁹) = 2.5 ×10¹⁸.
For more visit here:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
The electric potential on the axis of an electric dipole at a distance r from its centre is V. Then the potential at a point at the same distance on itsequatorial line will be
(d) Zero. The electric potential due to a dipole at any point on its equatorial line is always zero. This is because the contributions from the positive and negative charges cancel each other out, as they are equidistant from the point and their potentials have equal magnitudes but opposite signs, rRead more
(d) Zero. The electric potential due to a dipole at any point on its equatorial line is always zero. This is because the contributions from the positive and negative charges cancel each other out, as they are equidistant from the point and their potentials have equal magnitudes but opposite signs, resulting in a net potential of zero.
For more visit here:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
In a chamber, three spheres carry charges + 3 e, + 5 e and – 3 e. They came in contact for a moment and got separated. Which one of the following are possible values for the final charges on the spheres?
The correct answer is (d) +5e, -8e, +7e. When conductors come in contact, charge redistributes while conserving total charge. The initial total charge is (+3e) + (+5e) + (-3e) = +5e. Among the given options, only (d) +5e, -8e, +7e maintains this total charge, satisfying charge conservation and possiRead more
The correct answer is (d) +5e, -8e, +7e. When conductors come in contact, charge redistributes while conserving total charge. The initial total charge is (+3e) + (+5e) + (-3e) = +5e. Among the given options, only (d) +5e, -8e, +7e maintains this total charge, satisfying charge conservation and possible redistribution after separation.
For more visit here:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
Atomic mass of chlorine is
(b) 35.5 u. Chlorine has two isotopes, ³⁵Cl (75%) and ³⁷Cl (25%), and its atomic mass is the weighted average of these isotopes. The calculation gives (35 × 0.75) + (37 × 0.25) = 35.5 u, making 35.5 u the correct atomic mass. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
(b) 35.5 u. Chlorine has two isotopes, ³⁵Cl (75%) and ³⁷Cl (25%), and its atomic mass is the weighted average of these isotopes. The calculation gives (35 × 0.75) + (37 × 0.25) = 35.5 u, making 35.5 u the correct atomic mass.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-3/
See lessWhich statement is true for Gauss Law?
Gauss’s law states that the total electric flux through a closed surface depends only on the net charge enclosed, not on the field's uniformity. It applies even in non-uniform fields, as the integral form accounts for variations in the electric field at different points. (c) Gauss’s theorem can be aRead more
Gauss’s law states that the total electric flux through a closed surface depends only on the net charge enclosed, not on the field’s uniformity. It applies even in non-uniform fields, as the integral form accounts for variations in the electric field at different points.
(c) Gauss’s theorem can be applied to a non-uniform electric field.
For more visit here:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
Electric field lines contract longitudinally. This is because of
Electric field lines contract longitudinally due to the attractive force between opposite charges, which pulls the field lines together. This contraction represents the tendency of opposite charges to come closer, reducing potential energy and maintaining the natural behavior of electric fields. (a)Read more
Electric field lines contract longitudinally due to the attractive force between opposite charges, which pulls the field lines together. This contraction represents the tendency of opposite charges to come closer, reducing potential energy and maintaining the natural behavior of electric fields.
(a) Attraction between unlike charges.
For more visit here:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
Which statement is true for Gauss Law?
Gauss’s law states that the total electric flux through a closed surface depends only on the net charge enclosed, not on the field's uniformity. It applies even in non-uniform fields, as the integral form accounts for variations in the electric field at different points. (c) Gauss’s theorem can be aRead more
Gauss’s law states that the total electric flux through a closed surface depends only on the net charge enclosed, not on the field’s uniformity. It applies even in non-uniform fields, as the integral form accounts for variations in the electric field at different points.
(c) Gauss’s theorem can be applied to a non-uniform electric field.
For more visit here:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
In the process of charging, a positively charged body
When a body becomes positively charged, it loses electrons, which have a small mass. Since electrons have mass, the body's overall mass slightly decreases during the charging process. However, this mass loss is extremely small and generally negligible. Answer: (a) Loses mass. For more visit here: htRead more
When a body becomes positively charged, it loses electrons, which have a small mass. Since electrons have mass, the body’s overall mass slightly decreases during the charging process. However, this mass loss is extremely small and generally negligible. Answer: (a) Loses mass.
For more visit here:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-1/
Which one of the following is not a cereal crop?
Cereal crops are grasses grown for their edible grains. Millets, sorghum and maize are all cereal crops, while lentil is a pulse crop, not a cereal. Pulses are legumes grown for their protein-rich seeds, whereas cereals primarily provide carbohydrates. Answer: (a) Lentil. https://www.tiwariacademy.cRead more
Cereal crops are grasses grown for their edible grains. Millets, sorghum and maize are all cereal crops, while lentil is a pulse crop, not a cereal. Pulses are legumes grown for their protein-rich seeds, whereas cereals primarily provide carbohydrates. Answer: (a) Lentil.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
See less