On rotating a point charge having a charge $q$ around a charge $Q$ in a circle of radius $r$. The work done will be
On rotating a point charge having a charge $q$ around a charge $Q$ in a circle of radius $r$. The work done will be
- [AIIMS 1997]
- A
$q \times 2\pi r$
- B
$\frac{{q \times 2\pi Q}}{r}$
- C
Zero
- D
$\frac{Q}{{2{\varepsilon _0}r}}$
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- [IIT 2006]
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