Question

An ac source is rated at 220V, 50 Hz. The time taken for voltage to change from its peak value to zero is

• A. 50 sec
• B. 0.02 sec
• C. 5 sec
• D. $5\times {10}^{-3}sec$

Answer 1

The correct option is D $5\times {10}^{-3}sec$

Required time $t=\frac{T}{4}=\frac{1}{4\times 50}=5\times {10}^{-3}sec$