1.

If the rms current in a 50 Hz a.c. circuit is 5 A, the value of the currents 1/300 s after its value becomes zero is

Answer»

`5sqrt(2)` A
`5sqrt(3/2)` A
`5/6` A
`5/sqrt(2) A`

Solution :Here `I_(rms) = 5A`, hence `I_(m) = sqrt(2) xx 5 A` and v = `2pi omega = 2pi xx 50 = 100 npi`
`therefore I = I_(m) sin OMEGAT = sqrt(2) xx 5 sin (100 pi) xx 1/300 = sqrt(2) xx 5 xx sin pi/3 = 5sqrt(3/2)`


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