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Q.

Two identical rings P and Q of radius 0.1 m are mounted coaxially at a distance 0.5 m apart. The charges on the two rings are 2μC and 4μC, respectively. The work done in transferring a charge of 5μC from the center of P to that of Q is

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a

1.28 J

b

0.72 J

c

0.144 J

d

2.24 J

answer is B.

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Detailed Solution

V1=k×2×10−60.1+k×4×10−6(0.1)2+(0.5)2V2=k×4×10−60.1+k×2×10−6(0.1)2+(0.5)2Work done is q(V2− V1) = 0.72 J

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