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Q.

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

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a

b

c

d

answer is C.

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Detailed Solution

The following two arguments shall lead us to the right choice. i) Electric field at the center of the ring is zero. ii) Electric field is directed away from the ring.
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