Question

Find the resistivity of a material having resistance 20kohm, area 2 units and length of 12m.

(a) 6666.6

(b) 3333.3

(c) 1200

(d) 2000

This question was addressed to me by my college professor while I was bunking the class.

This key question is from Resistances and Capacitances topic in chapter Electrostatic Boundary Value Problem of Electromagnetic Theory

Answer 1

Correct answer is (b) 3333.3

To elaborate: The resistance of a material is given by R = ρL/A. To get ρ, put R = 20 x 10^3, A = 2 and L = 12. We get ρ = 3333.3 units.