Question

Calculate potential of a metal plate of charge 28C and capacitance 12 mF.

(a) 3.33 kohm

(b) 2.33 kohm

(c) 3.33 Mohm

(d) 2.33 Mohm

The question was posed to me in an international level competition.

The origin of the question is Method of Images topic in portion Electrostatic Boundary Value Problem of Electromagnetic Theory

Answer 1

Right option is (b) 2.33 kohm

The explanation is: Potential is given by V = Q/C. Put Q = 28C and C = 12 mF. We get V = 28/12 x 10^-3 = 2.333 x 10^3 ohm.