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In the given AC circuit, when switch S i...

In the given AC circuit, when switch S is at position 1, the source emf leads current by `pi/6`. Now, if the switch is at position 2, then

A

current leads the source emf by `pi/4`

B

current leads source emf by `pi/3`

C

source emf leads current by `pi/4`

D

source emf leads current by `pi/3`

Text Solution

Verified by Experts

The correct Answer is:
A
In position-1
`tanpi/6 = omegaL / R = (1000)(sqrt 3 xx 10^(-3)) / R` or `1 / sqrt 3 = sqrt 3/R`
In position-2
`tanphi = X_C/R = (1/omegaC)/R`
`= 1/(1000 xx 1000 / 3 xx 10^(-6) ) / 3 = 1`
`therefore` `phi` = `pi / 4`
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