Charged particles amounting to -9C are placed on a spherically conducting shell having a point particle of charged +3C at the center of its cavity. What is the net charge on the INNER surface of the shell? A. - 9C. B. - 7C. C. -3C. D. +3C. E. +7C.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.