Answer: 3978 pF
Explanation:
Capacitance can be defined as ability to store charge. It is the ratio of charge over electric potential.
[tex] C =\epsilon_o \frac{A}{d}[/tex]
where, A is the area of the plates and d is the distance between plates forming the capacitor.
diameter of the plates, di = 15 cm =0.15 m
radius of the plate, r = di/2 = 0.075 m
Area of the plates, A = πr² = 0.018 m²
Distance between the plates, d = 0.04 mm = 0.00004 m
Permittivity, ∈₀ = 8.84 × 10⁻¹² F/m
Capacitance, [tex] C = 8.84 \times 10^{-12} F/m \times \frac{0.018 m^2}{0.00004 m} = 3978 \times 10^{-12} F = 3978 pF[/tex]
