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Two identical thin rings, each of radius R metres, are coaxially placed at a distance of R metres from each other. If Q1 coulombs and Q2 coulombs are the charges uniformly spread on the two rings, the work done in moving a charge q from the centre of first ring to that of the second is 

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By Expert Faculty of Sri Chaitanya
a
Zero
b
qQ1−Q2(2−1)/2×4πε0R
c
q2Q1+Q2/4πε0R
d
qQ1+Q2(2+1)/2×4π∈0R

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detailed solution

Correct option is B

V1=kQ1R+kQ22RV2=kQ12R+kQ2RW=qV2−V1=kqQ2−Q11−12=14πε0(2−1)qQ2−Q12.

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A ring of radius I caries a charge +q. A test charge -qo is released on its axis at a distance 3R from its centre. How much kinetic energy will be acquired by the test charge when it reaches the centre of the ring ?

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