Question

A particle of mass m, charge q and kinetic energy t enters a transverse uniform magnetic field of induction b . After 3 seconds the kinetic energy of the particle will be (2008) (a) t (b) 4 t (c) 3 t (d) 2 t

Answer 1

Answer is

(a) t

Because only the direction of velocity changes not the magnitude kinetic energy is dependent only on magnitude.

Answer 2

answer : option (a) t.

explanation : kinetic energy of particle depends only on mass of the particle and magnitude of its velocity. i.e., K.E = 1/2 mv²

but here, mass of particle and magnitude of velocity never change (just change its direction, due to presence in magnetic field.) so, the kinetic energy remains same.

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