1.

A capacitor, a resistor and 4 henry inductor are connected in series to an a.c. source of 50 Hz. Calculate capacitance of capacitor if the current is in phase with voltage.

Answer»

Solution :When V and I in PHASE
`X_(L) = X_(C ) v = (1)/(2PI) (1)/(sqrt(LC))`
`C = (1) /(4 pi^2 v^2 L)= (1)/(4 pi^2 XX 50 xx 50 xx (4)/(pi^2))`
`= 2.5 xx 10^(-5) = 25 muF.`


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