Current in a coil changes from 4 a to zero in 0.1 s and the emf induced is 100 v. The self inductance of the coil is
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EMF = Ldi/dt.
Initial current = 4 amp. Final current = 0 amp.
di/dt= 4 /0.1= 40.
100 = L*40.
L= 100/40= 2.5. And.
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