Part 1: Obtain the force experience by current-carrying wire with length L2 due to current-carrying wire with length L1? Part 2: Obtain the force experience by current-carrying wire with length L1 due to current-carrying wire with length L2?

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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.