Four charges q,-q,q and -q are placed at the vertices A, B, C and D of a square of side a. Find the work done in interchanging charges at B and C.

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\frac{k q^{2}}{a} (4 - \sqrt{2})

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\frac{k q^{2}}{a} (4 - 2 \sqrt{2})

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\frac{k q^{2}}{2 a} (4 - \sqrt{2})

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Solution

The correct option is C $\frac{k q^{2}}{a} (4 - 2 \sqrt{2})$

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Four charges q,-q,q and -q are placed at the vertices A, B, C and D of a square of side a. Find the work done in interchanging charges at B and C.

The correct option is C kq2a(4−2√2)

The correct option is C $\frac{k q^{2}}{a} (4 - 2 \sqrt{2})$