First slide

Inductance

Question

The mutual inductance of an induction coil is 5H. In the primary coil, the current reduces from 5A to zero in 10^-3 s. What is the induced emf in the secondary coil

Moderate

A

2500 V
B

25000 V
C

2510 V
D

zero

Solution

$e = - M \frac{di}{dt} = - 5 \times \frac{(- 5)}{10^{- 3}} = 25000 V$

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