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A thin ring of radius equal to 25 cm carries a uniformly distributed charge of 4.7 nC. What is the electric field and potential difference at the center of the ring?

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    Because of symmetry, the field at the center is zero.

    Since the potential due to charge element dq (relative to the value at infinity)is k dq/r, and all charges are equidistant from the center, the potential is k Q/R

    k is the Coulomb constant. Q is the total charge. R is the ring radius

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