Physics - EMI/AC Question with Solution | TestHub

PhysicsEMI/ACSelf and mutual inductorEasy2 minPYQ_2020

PhysicsEasysingle choice

The current $I$ in an inductance coil varies with time according to the graph given in the figure.

Which one of the following graphs gives the variation of voltage with time across the inductor?

Options:

Answer:

Solution:

The voltage across an inductor is

$V = - L \frac{d i}{d t}$

So the voltage across the inductor will always be opposite to the rate of change of current.

When $\frac{d i}{d t} > 0$ then $V < 0$ and vice versa

Also, the magnitude of $V$ is proportional to the magnitude of $\frac{d i}{d t}$ .

When $\frac{d i}{d t}$ decreases, $V$ also decreases

Stream:JEESubject:PhysicsTopic:EMI/ACSubtopic:Self and mutual inductor

⏱ 2mℹ️ Source: PYQ_2020

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