Question

Find the number of plates in the multi plate capacitor having C=20F absolute permittivity=5F/m, A=4m^2 and d=2m.

(a) 1

(b) 2

(c) 3

(d) 4

I had been asked this question by my school principal while I was bunking the class.

This intriguing question comes from Capacitance of a Multi Plate Capacitor in portion Capacitance and Capacitors of Basic Electrical Engineering

Answer 1

The correct answer is (c) 3

Best explanation: The formula for capacitance of a multi plate capacitor: C=Actual permittivity*(n-1)*A/d.

Substituting the given values in the equation, we get n=3.