| ASSERTION: If a point charge be rotated in a circle around a charge the work done will be zero. |
| REASON: Work done is equal to dot product of force and distance. |
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 :
Work done will be zero because in rotating the charge in a circle, force is along the radius and direction of motion is perpendicular to it. \[\therefore \]Work done, \[W=\overrightarrow{F}\,\,.\,\,\overrightarrow{S}=FS\,\cos \theta =FS\,\cos 90{}^\circ =0\]
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