Alternating Current - Result Question 3

3. The current $(I)$ in the inductance is varying with time according to the plot shown in figure. [2012]

Which one of the following is the correct variation of voltage with time in the coil? (a)

(b)

(c)

(d)

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Answer:

Correct Answer: 3. (d)

Solution:

  1. (d) $V=-L \frac{d i}{d t}$

Here $\frac{d i}{d t}$ is + ve for $\frac{T}{2}$ time and

$\frac{d i}{d t}$ is - ve for next $\frac{T}{2}$ time so