The equivalent capacitance of the combination shown in the figure between P and Q is `30muF`, the capacitance of capacitor C is

Options

A. `20muF`
B. `30muF`
C. `40muF`
D. `60muF`

Answer

D

Explanation

Capacitance of parallel combination of three capacitors ltbRgt (each of `20muF`)
`C'=20+20+20`
`=60muF`
Now, `(1)/(C)+(1)/(C')=(1)/(30)` or
`(1)/(C)=(1)/(30)-(1)/(60)=(1)/(60)` or `C=60muF`