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NEET2018PhysicsMagnetic Effects of CurrentActual

Assertion : Magnetic field can not change kinetic energy of a moving charge. Reason : Magnetic field can not change velocity vector.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

Magnetic force on moving charge is always perpendicular to its velocity. F =q(v B ) Also, work done by magnetic force on a moving charge is zero.

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