First slide

Inductance

Question

In a coil of self inductance 0.5 henry, the current varies at a constant rate from zero to 10 amperes in 2 seconds. The e.m.f. generated in the coil is

Moderate

A

10 volts
B

5 volts
C

2.5 volts
D

1.25 volts

Solution

$\frac{Δi}{Δt} = \frac{10}{2} = 5 A / \sec \Rightarrow e = L \frac{Δi}{Δt} = 0 .5 \times 5 = 2 .5 volts$

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