2. The resistance of a certain conductor , 300 mil diameter and 20 ft long is 200 x10^-3 n. Calculate its resistivity in micro-ohms (u-2).

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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.