Assertion(A): In an uniform magnetic field, speed and kinetic energy remains the same for a moving charged particle.
Reason (R): In the case of motion of a charge in a magnetic field, the magnetic force is perpendicular to the velocity of the particle. So, no work is done and no change in the magnitude of the velocity (speed) and kinetic energy is produced.

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Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

Both A and R are false

answer is A.

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Detailed Solution

In the case of motionof a charge in a magnetic field, the magnetic force is perpendicular to the velocity of the particle. So, no work is done and no change in the magnitude of the velocity (speed) and kinetic energy is produced.

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