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NCERT Class XII Chapter
Electrostatic Potential and Capacitance
Questions With Solutions

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Question : 8
Total: 37
In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10–3m2 and the distance between the plates is 3 mm. Calculate the capacitance of the capacitor. If this, capacitor is connected to a 100 V supply, what is the charge on each plate of the capacitor?
Solution:  
A = 6 × 10−3m2 , d = 3 mm = 3 × 10−3 m , V = 100 V
C0 =
ε0A
d
 =
8.85×10−12×6×10−3
3×10−3
 = 17.7 × 10−12 F or C0 = 17.7 pF = 18 pF
On connecting the capacitor across 100 V supply, charge on each plate of the capacitor is
Q0 = C0V = 18 × 10−12 × 100 or Q0 = 18 × 10−9 C
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