First slide

Force on a charged particle moving in a magnetic field

Question

A particle of mass m, charge Q and kinetic energy T enters a tranverse uniform magnetic field of induction $\vec{B}$ . After 3 s, the kinetic energy or the particle will be

Easy

A

3T
B

2T
C

T
D

4T

Solution

After passing through a magnetic field, the magnitude of its mass and speed of the particle remain the same, so its energy does not change, i.e., kinetic energy will remain T.

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