The time required for a 50Hz alternating...

The time required for a 50Hz alternating current to increase from zero to `70.7%` of its peak value is-

2.5ms

10ms

20ms

14.14ms

Text Solution

Verified by Experts

The correct Answer is:

We know that `i=i_(0)sin omegat`
`i=i_(0)sin(100pit)`
`0.707i=i_(0)sin(100pit)`
`1/(sqrt(2))=sin(100pit)`
`(pi)/4=100pit`
`t=1/400`
`t=2.5ms`

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