Question

Two circular conducting plates of radius 20 cm are placed parallely at 2 mm from each other find the capacitance of the system .

Answer 1

Capacitance[C] = (Epsilon Naught[Eo] * Area of the Plates[A]) / Distance between the plates[d]
which leads to the formula, C = (Eo*A)/d
The radius = 20cm and circular plates, which will help to find the area of plates of capacitor [A] = $\pi$ r² = (22*20*20)/7 = 1257.14cm²
Distance is 2mm, has to be converted into centimeters. Therefore, 2/10cm = 0.2cm
We have Area and Distance. Putting in the formula for Capacitance,

C = (Eo*A)/d

C = {[8.854*10^(-12)]*[1257.14]}/0.2

C = 5.565*10^(-8)