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Capacitors - Engineering

Q1:

A 2 F, a 4 F, and a 10 F capacitor are connected in series. The total capacitance is less than

A 2 F

B 4 F

C 10 F

D 1.5 F

ANS:D - 1.5 F

1/C=1/2+1/4+1/10.
=>1/C=(10+5+2)*20,
=>1/C=17/20.
=>C=20/17=1.18<1.5.