In the figure, the current in a solenoid is decreasing at a rateof -4.6 A/s. The

Question

In the figure, the current in a solenoid is decreasing at a rateof -4.6 A/s. The self-induced emf in the solenoid is found tobe 5.1 V.

What is the self-inductance of the solenoid?

In the figure, the current in a solenoid is decreasing at a rateof -4.6 A/s. The self-induced emf in the solenoid is found tobe 5.1 V. What is the self-inductance of the solenoid? If the current is in the direction from b to a in the sketch, which point, a or b is at higher potential? The solenoid hasnegligible resistance.

Explanation / Answer

rate of decreasing in current di / dt = -4.6 A / s The self-induced emf in the solenoid is   E = 5.1 V we know   E = -L di / dt from this inductance L = -E / ( di / dt )                                    = 1.1086 H

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