1. A long, straight, cylindrical copper wire with radius a carries a constant current I. Consider a segment of this wire of length L » a and resistance R. Assume that the current density is uniform and that the charge carriers have neutral net charge density. (a) Integrate the energy flux density through the surface of the wire to show that the total EM power into the surface is PR. (b) Find the total electromagnetic energy and momentum per unit length in the wire.

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Electric field

A physical field present around an electrically charged particle that exerts a force on all other charged particles is called an electric field. The charged particles present in the field either repel or attract. From electric charges or time-varying magnetic fields, the electric field originates. One of the manifestations of electromagnetic force which is one of the four fundamental forces present in nature are the electric fields and magnetic fields.