Answer :

Given, C1 = C2 = C3 = 9 pF = 9 x 10-12 F

V = 120 volt

(a) Total capacitance of the series combination is given by

Cnet = 3 x 10-12 F = 3 pico-Farad.

(b) Let q be the charge on each capacitor.

Sum of the potential difference across the plates of the three capacitors must be equal to 120 V

V1 + V2 + V3 = Vnet

( Vnet = 120 V)

q = 360 x 10-12 C

Therefore, potential difference across a capacitor

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