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The time required for a 50 Hz sinusoidal...

The time required for a 50 Hz sinusoidal alternating current to changed its value from zero to the r.m.s. value

A

`1.5xx10^(-2)` S

B

`2.5xx10^(-3)` s

C

`10 ^(-1)` s

D

`10 ^(-6)` s

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The correct Answer is:
B
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