The length of a certain wire is kept same while its radius is doubled. What is the new resistivity of this wire?
A) It is increased by a factor of 4.
B) It is reduced by a factor of 4.
C) It is increased by a factor of 2.
D) It is reduced by a factor of 2.
E) It does not change.

Question

Quizplus · Accepted Answer

Resistivity is a material property and does not depend on the dimensions of the material, such as its length or radius. Therefore, changing the radius of the wire while keeping its length the same does not affect its resistivity.

The Length of a Certain Wire Is Kept Same While