After a point charge, +7Q, is placed inside the cavity of a conductor, electrostatic equilibrium is attained. After an additional charge of amount, -5Q, is placed on the surface of the inner cavity, electrostatic equilibrium is attained once again. What is the net charge on the inner and outer surfaces of the conductor, respectively?   a. -2Q, -7Q   b. -7Q, -2Q   c. -7Q, +2Q   d. +7Q, -2Q   e. +7Q, +2Q

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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.