The current in the wire varies with time according to the relation I = 55 A –(0.65 A/s^2)t^2. a. How many coulombs of charge pass a cross-section of the wire in the time interval between t = 0 and t = 8.0 s? b. What constant current would transport the same charge in the same time interval? Note: In problem 2, A means ampere, s means second.

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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.