First slide

Inductance

Question

The current passing through a choke coil of 5 henry is decreasing at the rate of 2 ampere/sec. The e.m.f. developing across the coil is

Moderate

A

10 V
B

– 10 V
C

2.5 V
D

– 2.5 V

Solution

$Given \frac{di}{dt} = 2 A / \sec ., L = 5 H ∴ e = L \frac{di}{dt} = 5 \times 2 = 10 V$

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