First slide

Alternating Current and voltage

Question

The current 'i' in an inductance coil varies with time 't' according to following graph
Which one of the following plot shows the variations of voltage in the coil

Moderate

A
B
C
D

Solution

(1) For time interval 0 < t < T/2
$I = kt,$ where k is the slope
For inductor as we know, induced voltage $V = - L \frac{di}{dt}$
$\Rightarrow V_{1} = - KL$
(2) For time interval $\frac{T}{2} < t < T$
$I = - Kt \Rightarrow V_{2} = KL$

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