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# The current in a coil drops from 3.5 A to 2.0 A in 0.50 s. If the average emf induced in the coil is 12 mV, what is the self-inductance of the coil?

## 0.004 \mathrm{H}

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##### Andy C.

University of Michigan - Ann Arbor

LB
##### Marshall S.

University of Washington

##### Jared E.

University of Winnipeg

### Video Transcript

All right. So the induced enough physical to induct Inzell Times the rate of change off current Um huh, which can be written as Delta I over Delta t rearranging this equation to get inductions inducted Sequel That, uh, the M F times Delta t over Delta I. So now we plug in values. M f is 12 1,000,000 volts said. That's 12 times telling like of three votes. Ah, time taken his 0.5 seconds. And that's divided by a change in current, which is 1.5. And that's because 3.5 minus two ampere. That's the change, giving you an inductive of about four times in a negative. To me, her of Henry's. That's the moment this is equivalent to four Millie heavies. That's it.

New Mexico State University
##### Andy C.

University of Michigan - Ann Arbor

LB
##### Marshall S.

University of Washington

##### Jared E.

University of Winnipeg