A spherical shell of radius \( \mathrm{R} \) with a uniform charge ...

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A spherical shell of radius \( \mathrm{R} \) with a uniform charge \( q \) has point charge \( q_{0} \) at its centre. Find the work performed by the electric forces during the shell expansion slowly from radius \( R \) to \( 2 R \). Also find out work done by external agent against electric forces.
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