2.8 In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10–3 m2 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?
2.8 In a parallel plate capacitor with air between the plates, each plate has an area of 6 × 10–3 m2 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?
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1 Answer
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2.8 Area of each plate, A = 6
Distance between plates, d = 3 mm = 3 m
Supply voltage, V = 100 V
Capacitance C of the parallel plate is given by C =
In case of air, dielectric constant k = 1 and
= permittivity of free space = 8.854
Hence C = F = 17.708 F = 17.71 pF
Charge on each plate of the capacitor is given by q = VC = 100 C
= 1.771 C
Therefore, capacitance of the capacitor is 17.71 pF and charge on each plate is 1.77 C
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