In a `LCR` circuit the `P.D` between the terminals of the inductance is `60V`, between the terminals of the capacitor is `30V` and that between the terminals of resistance is `40V`. The supply voltage will be equal to......

Options

A. 50 V
B. 70 V
C. 130 V
D. 10 V

Answer

A

Explanation

In L-C-R series circuit,
`V=sqrt(V_(R)^(2)+(V_(L)-V_(C))^(2))`
`=sqrt((40)^(2)+(60-30)^(2))`
`=sqrt(1600+900)=sqrt(2500)=50V`