Assertion : A charge particle is released from rest in a magnetic field then it will move in circular path.…

Assertion : A charge particle is released from rest in a magnetic field then it will move in circular path. Reason : Work done by a magnetic field on the charged particle is non zero.
  1. both assertion and reason are true and reason is the correct explanation of assertion.
  2. both assertion and reason are true but reason is not the correct explanation of assertion.
  3. assertion is true but reason is false.
  4. both assertion and reason are false.

Solution

Magnetic force on a charge particle, $\vec{F}=q(\vec{v} \times \vec{B})$ If $v=0$ then $F=0$ /

Asked in: NEET 2012 (Mains)

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