How to find electrostatic interaction energy?

In summary: Q on the surface of another sphere that is distanced r from Q.There is also charge... Q on the surface of another sphere that is distanced r from Q.
  • #36
he took uniformly charged shell
 
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  • #37
gracy said:
he took uniformly charged shell
Which means that it has nothing to do with the question you asked in post #29.
 
  • #38
you mean we can use that formula for system of uniformly charged shell +charge q but not for system of uniformly charged sphere +charge q ?
 
  • #39
The distinction is between "uniformly charged" and "conducting". They are contradictory conditions if there is an external field.

Have you read responses #4, #6, #8 and #20?
 

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