alculate the electric field on the surface of the wire. The inner diameter of the tube is 21.3 mm and the diameter of the wire is 131 μm. A voltage of 818 V is connected between the wire and the pipe.

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Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.