The current in a coil drops from 3.9 A to 1.9 A in 0.52 s. If the average emf in

Question

The current in a coil drops from 3.9 A to 1.9 A in 0.52 s. If the average emf induced in the coil is 12 mV, what is the self-inductance of the coil? mH An electromagnet can be modeled as an inductor in series with a resistor. Consider a large electromagnet of inductance L = 14.5 H and resistance R = 6.00 Ohm connected to a 18.0-V battery and switch as in the figure shown below. After the switch is closed, find the following the maximum current carried by the electromagnet A the time constant of the circuit s the time it takes the current to reach 95.0% of its maximum value s

Explanation / Answer

4)induced emf=Ldi/dt

12*10^-3=2/(0.52)*L

L=3.12 mH

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