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Question

A ring of radius R is charged uniformly with a charge +Q. The electric field at any point on it axis at a distance from the circumference of the ring will be:
  1. KQr
  2. KQr2
  3. KQr3(r2R2)1/2
  4. KQrR3

A
KQr
B
KQr2
C
KQr3(r2R2)1/2
D
KQrR3
Solution
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