An isolated conductor of arbitrary shape has a net charge of +1.20×10-5 C. Inside the conductor is a cavity within which is a point charge q = +3.60×10-6 C. a)What is the charge on the cavity wall?  b)What is the charge on the outer surface of the conductor?

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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.