Question

A cylindrical graphite resistor has length L and cross–sectional area A. It is to be placed into a circuit, but it first must be cut in half so that the new length is ½ L. What is the ratio of the new resistivity to the old resistivity of the cylindrical resistor?

(A) 4 

(B) 2 

(C) 1 

(D) ½ 

(E) ¼

Answer 1

The correct option is: (C) 1

Explanation:

Resistivity is dependent on the material. Not to be confused with resistance.