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Two identical thin ring, each of radius ...

Two identical thin ring, each of radius R meters, are coaxially placed a distance R metres apart. If `Q_1` coulomb, and `Q_2` coulomb, are repectively the charges uniformly spread on the two rings, the work done in moving a charge q from the centre of one ring to that of the other is

A

Zero

B

`(q(Q_(2)-Q_(1))(sqrt(2)-1))/(sqrt(2).4 pi in_(0)R)`

C

`(qsqrt(2)(Q_(1)+Q_(2)))/(4pi in_(0)R)`

D

`(q(Q_(1)+Q_(2))(sqrt(2)+1))/(4pi in_(0)R)`

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