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A length of copper wire carries a current of 15 A, uniformly distributed through its cross section. The wire diameter is 2.5 mm, and its resistance...

A length of copper wire carries a current of 15 A, uniformly distributed through its cross section. The wire diameter is 2.5 mm, and its resistance per unit length is 3.5ohms/km.

Calculate the energy density of the electric field at the surface of the wire.

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