Sunday, January 24, 2010

Irodov Problem 3.10

The net electric field at a point O is the sum of the electric field Ering due to the ring and Eq due to the charge located at the center. In Problem 3.9 we have already derived Ering (in Eqn 4) as,

The electric field due to the point charge at the center of the ring is given by,

The net electric field is given by,

We can rewrite (3) as,


  1. Sir, there is a problem in the Maclaurin series expansion. It should be 3 instead of 3/2
    and hence, the answer will have 4 in the denominator.

  2. The answer doesn't match to that given in the book. Plz check

  3. Why is we cannot apply x>>r in the equation 3

  4. yeah asked by rahul anand why cant we directly neglect r in eqn 3