The sphere on the right has a spherical cavity of radius 2a. Both spheres are separately isolated. Both spheres have the same positive uniform charge density p. The magnitude of the electric field at point C is 2 V/m. What is the amplitude of the electric field at point O in the hollow sphere? Give your answer in V/m.

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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.