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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_1-Q_2)(sqrt2-1))/(sqrt2. 4pi epsilon_0R)`

C

`(qsqrt2(Q_1+Q_2))/( 4pi epsilon_0R)`

D

`(q(Q_1+Q_2)(sqrt2+1))/(sqrt2. 4pi epsilon_0R)`

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