Physicshard · Past Paper
A particle is moving in a circle of radius r under a force F = -k/r^2. The work done in one full revolution is:
A-k/r
B2*pi*k/r
CZero
Dk/r
✓ Correct Answer: C — Zero
For a conservative force or any force acting perpendicular to motion (like centripetal), work done over a closed path or circle is zero.
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