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Q.

Figure shows three circular arcs, each of radius R and total charge as indicated. The net electric potential at the center of curvature is 

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a

3Q32πε0R

b

none of these

c

Q2πε0R

d

5Q12πε0R

answer is A.

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Detailed Solution

Charge can be considered as located at a distance R from the center. Total charge is (Q−2Q+3Q)=2Q

Hence V=14πε02QR=Q2πε0R

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Figure shows three circular arcs, each of radius R and total charge as indicated. The net electric potential at the center of curvature is