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Two identical thin rings each of radius R are placed co-axially at a distance R apart. If $Q_{1} and Q_{2}$ 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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Zero

qQ1-Q22-14πε0 2R

qQ1+Q2 4πε0 x 2R

qQ1+Q24πε0 x 2+1 2R

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detailed solution

Correct option is B

W=q ∆V=qkQ1R+kQ22R-kQ2R-kQ2R2

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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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Ready to Test Your Skills?

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Two identical thin rings each of radius R are placed co-axially at a distance R apart. If $Q_{1} and Q_{2}$ 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 :