The correct answer is: Assertion is true but Reason is false.

Explanation:

The kinetic energy of a charged particle moving in a perpendicular uniform magnetic field does not change. This is because the magnetic force is always perpendicular to the velocity of the particle, and hence does no work on it. The kinetic energy, which is the energy of motion, remains constant if no work is done on the particle.

However, the reason given is incorrect. The velocity of the charged particle does change in the magnetic field. It's the speed that remains constant, not the velocity. Velocity is a vector quantity, which means it has both magnitude (speed) and direction. In a magnetic field, the direction of the velocity of the charged particle changes, which means the velocity changes. However, the magnitude of the velocity (the speed) remains constant, which is why the kinetic energy remains constant.

Question

The correct answer is: Assertion is true but Reason is false.

Explanation:

The kinetic energy of a charged particle moving in a perpendicular uniform magnetic field does not change. This is because the magnetic force is always perpendicular to the velocity of the particle, and hence does no work on it. The kinetic energy, which is the energy of motion, remains constant if no work is done on the particle.

However, the reason given is incorrect. The velocity of the charged particle does change in the magnetic field. It's the speed that remains constant, not the velocity. Velocity is a vector quantity, which means it has both magnitude (speed) and direction. In a magnetic field, the direction of the velocity of the charged particle changes, which means the velocity changes. However, the magnitude of the velocity (the speed) remains constant, which is why the kinetic energy remains constant.

Knowee AI · Accepted Answer

The correct answer is: Assertion is true but Reason is false.

Explanation:

The kinetic energy of a charged particle moving in a perpendicular uniform magnetic field does not change. This is because the magnetic force is always perpendicular to the velocity of the particle, and hence does no work on it. The kinetic energy, which is the energy of motion, remains constant if no work is done on the particle.

However, the reason given is incorrect. The velocity of the charged particle does change in the magnetic field. It's the speed that remains constant, not the velocity. Velocity is a vector quantity, which means it has both magnitude (speed) and direction. In a magnetic field, the direction of the velocity of the charged particle changes, which means the velocity changes. However, the magnitude of the velocity (the speed) remains constant, which is why the kinetic energy remains constant.

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