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Asked: March 28, 2025In: Class 12 Physics

There are unifonn electric and magnetic fields in a region pointing along X-axis. An α-particle is projected along Y-axis with a velocity v. The shape of the trajectory will be :

The correct answer is (C) Helical with its axis parallel to X-axis. The electric field exerts a force along the X-axis, while the magnetic field causes circular motion in the YZ plane. The superposition of linear and circular motions results ...

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Ravi Kishan Verma

Asked: March 28, 2025In: Class 12 Physics

A current of 5 A is flowing from east to west In a long straight wire kept on a horizontal table. The magnetic field developed at a distance of 10 cm due south on the table is :

The magnetic field due to a straight current-carrying wire is given by B = μ0I/2πr . Substituting μ0 = 4π × 10⁻⁷ , I = 5 A and r = 0.1 m, B = 1 × 10⁻⁵ T. Using the ...

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Ravi Kishan Verma

Asked: March 28, 2025In: Class 12 Physics

A current 10 A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field developed at a distance of 10 cm due north on the table is

The magnetic field due to a straight current-carrying wire is given by B = μ0I/2πr. Substituting μ0 4π × 10⁻⁷, I = 10 A and r = 0.1 m, B = 2 × 10⁻⁵ T. Using the right-hand rule, ...

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Sanjay01 Kumar

Asked: March 28, 2025In: Class 12 Physics

Two resistors of resistance, 100 Ω and 200 Ω are connected in parallel in an electric circuit. The ratio of the thermal energy developed in 100 Ω to that in 200 Ω in a given time is

In a parallel circuit, power P = V²/R. Since both resistors have the same voltage, the thermal energy ratio is inversely proportional to resistance. Thus, E100Ω : E 200Ω = 200 : 100 = 2:1. Answer: (b) 2:1.

Poll

Sanjay01 Kumar

Asked: March 28, 2025In: Class 12 Physics

Two batteries with emf 12 V and 13 V are connected in parallel across a load resistor of 10 Ω. The internal resistances of the two batteries are 1 Ω and 2 Ω respectively. The voltage across the load lies between

Using the formula for parallel battery circuits: V = 12/1 + 13/2 /1/1 + 1/2 = 12 + 6.5/1.5 = 11.67V Thus, the answer is (a) 11.6 V to 11.7 V.

There are unifonn electric and magnetic fields in a region pointing along X-axis. An α-particle is projected along Y-axis with a velocity v. The shape of the trajectory will be :

A current of 5 A is flowing from east to west In a long straight wire kept on a horizontal table. The magnetic field developed at a distance of 10 cm due south on the table is :

A current 10 A is flowing from east to west in a long straight wire kept on a horizontal table. The magnetic field developed at a distance of 10 cm due north on the table is

Two resistors of resistance, 100 Ω and 200 Ω are connected in parallel in an electric circuit. The ratio of the thermal energy developed in 100 Ω to that in 200 Ω in a given time is

Two batteries with emf 12 V and 13 V are connected in parallel across a load resistor of 10 Ω. The internal resistances of the two batteries are 1 Ω and 2 Ω respectively. The voltage across the load lies between

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