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Question

There is a uniformly charged disc of radius R3 and surface charge density σ work done by electric field to brought a charge ϱ From centre of disc to distance R along its axis will be :-
  1. σQR(31))2ϵσ
  2. σQR2ϵσ(21))
  3. σQR2ϵσ(31)
  4. σQRϵσ

A
σQRϵσ
B
σQR(31))2ϵσ
C
σQR2ϵσ(31)
D
σQR2ϵσ(21))
Solution
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