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  4. A ball having a charge -100 e is placed at the centre of a hollow spherical shell which has a net charge of -20 e. What is the charge on the shell's outer surface?

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Q. A ball having a charge $-100 e$ is placed at the centre of a hollow spherical shell which has a net charge of $-20 e. $ What is the charge on the shell's outer surface?

Electric Charges and Fields

Solution:

When charged ball is placed at the center of a ball it induces opposite charge on the inner. surface by the induction further same nature charge will induce on the outer surface of shell. Hence the total charge on the surface of shell is $-100 e -20 e$ $=-120 e$
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