Question

The time taken by an alternating current of $50Hz$ in reaching from zero to its maximum value will be

• A. 0.5s
• B. 0.005s
• C. 0.05s
• D. 5s

Answer 1

Answer: (B)

An alternating current is one whose magnitude changes continuously with time between zero and a maximum value and whose direction reverses periodically. The relation between frequency $(f)$ and time $(T)$ is
$T=\frac{1}{f}=\frac{1}{50}=0.02s$

As is clear from the figure time taken to reach the maximum value is
$\frac{T}{4}=\frac{0.02}{4}=0.005s$