Question

The current $‘i^{\prime }$ in an inductance coil varies with time $‘t^{\prime }$ according to the following graph


Which one of the following plots shows the variations of voltage in the coil magnitude wise? (all vertical lines are not part of graphs)

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

(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 $\frac{T}{2}<t<T$
$I=-Kt\Rightarrow V_2=KL$