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The adjoining figure shows an AC circuit...

The adjoining figure shows an `AC` circuit with resistance `R`, inductance `L` and source voltage `V_S`. Then

A

the source voltage `V_s=72.8V`

B

the plane angle between current and source voltage is `tan^-1(7/2)`

C

both a and b are correct

D

both a and b are wrong

Text Solution

Verified by Experts

The correct Answer is:
A
`V_(S)=sqrt(V_R^2+V_L^2)`
`sqrt((70)^2+(20)^2)=72.8V`
`tanphi=X_L/r=V_L/V_R=20/70=2/7`
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