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A cube of side a has a charge q at each of its eight vertices. Find the potential and electric field at the centre of the cube.

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$\large\frac{1}{4 \pi \in_0} \frac{16 q}{\sqrt 3 a}$
Electric field at O due to all charges =zero.
Hence A is the correct answer.
answered Jun 9, 2014 by meena.p

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