An aluminum spherical ball of radius 4 cm is charged with 5 μC of charge. A copper spherical shell of inner radius 6 cm and outer radius 8 cm surrounds it. A total charge of -8 μC is put on the copper shell. When copper shell and aluminum sphere are concentric, find the electric field a distance 9 cm from the center of the copper shell.

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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.