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[" 12.For a uniformly charged ring of ra...

[" 12.For a uniformly charged ring of radius "R" ,the "17." In "],[" electric field on its axis has the largest "],[" magnitude at a distance h from its centre."],[" Then value of "h" is "],[[" 1) "(R)/(sqrt(5))," 3) "R," 4) "R sqrt(2)]]

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