A metal sphere of radius ra has a charge Qo. There is a concentric metal spherical shell of inner radius rp and outer radius re as shown in the figure. The metal shell has a total excess charge of -2Qo. Determine the electric C field as a function of r.

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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.