1.

On rotating a point charge having a charge q around a charge Q in a circle of radius r. The work done will be [CPMT 1990, 97; MP PET 1993; AIIMS 1997; DCE 2003; KCET 2005]

A.                    \[q\times 2\pi r\]
B.                                      \[\frac{q\times 2\pi Q}{r}\]
C.                    Zero
D.                                      \[\frac{Q}{2{{\varepsilon }_{0}}r}\]
Answer» D.                                      \[\frac{Q}{2{{\varepsilon }_{0}}r}\]


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