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Four charges +q, +q, -q, -q are fixed re...

Four charges +q, +q, -q, -q are fixed respectively at the corners of A, B, C and D of a square of side 'a' arranged in the given order. Calculate the electric potential and intensity at O (Center of square). If E and F are the midpoints of sides BC, CD respectively, what will be the work done by external agent in carrying a charge Q slowly from O to E and from O to F ?

A

`(4pi in_(0).a^(2))/(4sqrt(2)q)`

B

`(4sqrt(2q))/(4pi in_(0).a^(2))`

C

`(pi in_(0).a^(2))/(4sqrt(2)q)`

D

`(4sqrt(2)q)/(pi in_(0).a^(2))`

Text Solution

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The correct Answer is:
B
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