A small element l is cut from a circular ring of radius a and charge per unit length λ. The net electric field at the center of ring is
A
zero
B
C
infinity
D
Text Solution
Verified by ExpertsThe correct answer is:
B
If ring is complete, then net field at center is zero. As small portion is cut, then field opposite to this portion is not cancelled out.
Charge of small portion 
Electric field due to this portion 
Let 
is electric field of remaining portion.
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