A spherical shell of radius R with a uniform charge q has point charge qnot at its centre. Find the work performed by the electric forces during the shell expansion slowly from radius R to 2R. Also find out work done by external agent against electric forces.

initial potential energy of the system U=kqq0Rfinal potential energy of the system =kqq02Rwork done by the electric force =-U=-kqq02R-kqq0R=kqq02Rwork done by the external agent=U=-kqq02RRegards

  • -48
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