A) \[100\,r\,J\]
B) \[\left( \frac{r}{100} \right)J\]
C) \[\left( \frac{100}{r} \right)J\]
D) zero
Correct Answer: D
Solution :
[d] Work done \[=\text{ }F\text{ }S\text{ }cos\text{ }\theta \text{ =}FS\text{ }cos\text{ }90{}^\circ \text{ }=\text{ }0\] \[\therefore \text{ }cos\text{ }90{}^\circ =0\] You must also note that the work done by the centripetal force is zero.
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