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Moving Charges and Magnetism question

2008 · Q128
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Moving Charges and Magnetism question

2008 · Q128

NEETPhysicsMoving Charges and MagnetismMCQ+4 / −1
A particle of mass m, charge Q and kinetic energy T enters a transverse uniform magnetic field of induction B→\overrightarrow BB. After 3 seconds the kinetic energy of the particle will be
  1. A
    T
  2. B
    4 T
  3. C
    3 T
  4. D
    2 T
View written solutionFree

Correct answer: A

When a charged particle having a given K.E., T enters in a field of magnetic induction, which is perpendicular to its velocity, it takes a circular trajectory. It does not increase in energy, therefore T is the K.E.

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