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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:
- 3T
- 2T
- T
- 4T
Correct answer: T
Solution
In a uniform magnetic field, the magnetic force does no work on the charged particle because the force is always perpendicular to the velocity. Hence, the kinetic energy of the particle remains constant, and it will still be T after 3 seconds.
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