A capacitor, a `15Omega` resistor and 101.5 mH inductor are placed in series with 50 Hz. AC source. Calculate the capacitance of the capacitor, if the current is observed in phase with the voltage.
A. `25muF`
B. `50muF`
C. `75muF`
D. `100muF`

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1 Answers

Correct Answer - D
`f=(1)/(2pisqrt(LC))`
`therefore f^(2)=(1)/(4pi^(2)LC)`
`therefore C=(1)/(4pi^(2)f^(2)L)=(1)/(4xx9.87xx2500xx101.5xx10^(-3))` ltbgt `=100muF`

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