Question: When the 2 1 A current through an inductor is turned off in 1 . 5 ms , an 7 9 0 V emf is

When the 21 A current through an inductor is turned off in 1.5 ms, an 790 V emf is induced, opposing the change.
Randomized Variables
I =21 A
t =1.5 ms
E =790 V
What is the value of the self-inductance in mH?

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