Question

Three identical charged non-conducting circular disc of radius r having uniform surface charge density σ are placed in x-y plane as shown in figure.Distance between
centres of any two disc is l(l>>r)
. Find the electrostatic potential energy of the charge
configuration.
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Answer 1

Answer:

charge on each sphere= 4πr^2@

U = 3 x (1/4π¢°) (4πr^2@) x (4πr^2@) /L

=12 π r^4@^2/¢°L