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Four point charges $2q, q, −2q,$ and $−q$ are placed at the corners of a square as shown in the figure.Which of the following statements is correct about the electric field and the potential at the centre of the square (O)?

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(D) Both the electric field and the electric potential are not zero.
Hence D is the correct answer.
answered Jun 10, 2014 by meena.p

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