In the center of a metal sphere of radius 18.0cm there is a spherical cavity of radius 4.50cm. A point charge Q = 6.0µC is placed right in the center of the cavity. Determine the electric field at a point: a) 3.00 cm from the center of the cavity. b) 6.00 cm from the center of the cavity. c) 30.0 cm from the center.

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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.