A thin spherical shell of radius R carries charge Q uniformly. A point charge q is moved quasistatically from the centre of the shell to a point just inside its surface. The work done by the electrostatic field of the shell is:
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Question

A thin spherical shell of radius R carries charge Q uniformly. A point charge q is moved quasistatically from the centre of the shell to a point just inside its surface. The work done by the electrostatic field of the shell is:

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G1 Physics · Accepted Answer

The potential everywhere inside a uniformly charged spherical shell is constant, V=Q/(4πε₀R). Therefore the potential difference between the centre and any point just inside is zero, so the electrostatic work q( V i n i t i a l − V f i n a l ) = 0. V_initial-V_final)=0. V i ​ ni t ia l − V f ​ ina l ) = 0.