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A circular ring carries a uniformly distributed positive charge and lies in the xy plane with center at the origin of the cooredinate system. If at a point (0,0,z) the electric field is E, then which of the following graphs is correct?

A

B

C

D

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(b) At `Z=0, E=0` and between `Z=0` and `Z=oo` and `E` grows to a maximum value, which can found by `(dE)/(dt)=0`. Also graph (b) shouold be symmetric which is (b).
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