ElectrostaticsHard
Question
A circular ring carries a uniformly distributed positive charge. The electric field (E) and potential (V) varies with distance (r) from the centre of the ring along its axis as :
Options
A.

B.

C.

D.

Solution
E = 
It is maximum at r = ±
and also E is not a linear function of .
It is maximum at r = ±
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