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  4. A ball with charge 50 e is placed at the centre of a hollow spherical shell which has a net charge of - 50 e . What is the charge on the shells outer surface?

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Q. A ball with charge $50 \,e$ is placed at the centre of a hollow spherical shell which has a net charge of $- 50\,e$ . What is the charge on the shells outer surface?

Delhi UMET/DPMTDelhi UMET/DPMT 2010Electric Charges and Fields

Solution:

The net charge on the outer surface is $ -(50\,e-50\,e)=100\,e $