Question

The instantaneous value of current in an ac circuit is $i = 2\sin(100\pi t + \pi/3)A.$ The current at the beginning $(t = 0)$ will be

• A. $2\sqrt{3}A$
• B. $\sqrt{3}A$
• C. $\frac{\sqrt{3}}{2}A$
• D. Zero

Answer 1

Answer: (B)

$\sqrt{3}A$

Answer 2

At t = 0, $i = 2\sin\left( 0 + \frac{\pi}{3} \right) = 2 \times \frac{\sqrt{3}}{2} = \sqrt{3}A$.