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Q.

From a conducting ring of radius R which carries a charge Q (uniformly distributed) along it periphery a small length dl is cut-off. The electric field at the centre due to the remaining wire is

      

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a

zero  

b

Qdl8π2ε0R3

c

Qdl4π2ε0R3

d

Q4πε0R2

answer is A.

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Detailed Solution

if it was a complete ring electric field at the center would be zero. but now there will be an electric field due to the removed  part and that is 

Q2πRdl4πε0R2

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