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NCERT Class XII Chapter
Electrostatic Potential and Capacitance
Questions With Solutions

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Question : 6
Total: 37
Three capacitors each of capacitance 9 pF are connected in series.
(a) What is the total capacitance of the combination?
(b) What is the potential difference across each capacitors if the combination is connected to a 120 V supply?
Solution:  
(a) C =
C1
3
 =
9
3
 pF or C = 3 pF
(b) Net charge stored in combination of capacitors is
Q = CV = 3 × 10−12 × 120 = 360 pC
So, potential difference across each capacitor is
V1 =
Q
C1
 =
360pC
9pF
 or V1 = 40 volts
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