If the equivalent capacitance between points P and Q of the combination of the capacitors hown in figure below is `30muF`, the capacitor C is

Options

A. `60muF`
B. `30muF`
C. `10muF`
D. `5muF`

Answer

A

Explanation

`C'=C_(1)+C_(2)+C_(3)=20+20+20=60muF`
`(1)/(C'')=(1)/(C')+(1)/(60)`
`(1)/(C')=(1)/(30)-(1)/(60)=(1)/(60) rArr C'=60muF`