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 (a) T (b) 4 T (c) 3 T (d) 2 T

Answer: (a). Magnetic force is perpendicular to velocity, so it does no work. Speed and kinetic energy stay constant at all times. So the answer is (a) T.

A particle of mass m, charge Q and kinetic energy T enters a… | NEET 2008 (AIPMT)

Q111NEET 2008 · AIPMTEasy

Moving Charge in a Magnetic Field

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

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Answer: (a)

Magnetic force is perpendicular to velocity, so it does no work.
Speed and kinetic energy stay constant at all times.
So the answer is (a) T.

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