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Q.

Two identical thin rings each of radius R are placed co-axially at a distance R apart. If Q1 and Q2 are respectively 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 :

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a

Zero

b

qQ1-Q22-14πε0          2R

c

qQ1+Q2 4πε0           x 2R

d

qQ1+Q24πε0          x 2+1 2R

answer is B.

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W=q ∆V=qkQ1R+kQ22R-kQ2R-kQ2R2
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