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Four equal charges q each are placed at ...

Four equal charges q each are placed at four corners of a square of a square of side a each. Work done incarrying a charge -q from its centre to infinity is

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`W=(-Q) (Delta V)=-Q(V_f-V_i)=-Q (0-V_i), W=Q (1/(4pi e_0). (Qsqrt2)/a) times 4= (sqrt2 Q^2)/(pi e_0 a)`
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VMC MODULES ENGLISH-ELECTROSTATICS-LEVEL - 1
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