| ASSERTION: The work done by magnetic field on a moving charge is zero. |
| REASON: In magnetic field force is perpendicular to the velocity. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
We know that, work done, \[W=\overrightarrow{F}\,.\,\overrightarrow{s}=F\,s\,\cos \theta \]since force is acting perpendicular to the velocity (i.e. displacement), therefore, \[\theta =90{}^\circ \]and \[\cos \,90{}^\circ \] \[\therefore \,\,\,W=0\] Therefore, work done by magnetic field on a moving charge is zero.
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