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A solid sphere of silver, which is a good conductor, has a spherical cavity at its...

A solid sphere of silver, which is a good conductor, has a spherical cavity at its center. There is a point charge at the center of the cavity. The silver sphere has a charge of +9.00 nC on its outer surface and a charge of -2.00 nC on the surface of the cavity. What is the value of the point charge?

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Answer #1

Electric field is zero inside the conductor. Use definition of electric flux and Gauss’s law to find the required point charge at the centre of the cavity as shown below

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