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Question

Physics Question on Current electricity

The resistivity of a material is inversely proportional to

A

number density of electrons as well as relaxation time

B

number density of electrons and directly proportional to relaxation time

C

relaxation time and directly proportional to the number density of electrons

D

neither relaxation time nor number density of electrons.

Answer

neither relaxation time nor number density of electrons.

Explanation

Solution

As, π=mn e2 τ\pi = \frac{m}{n \, e^2 \, \tau} , we find, ϕ∝1n τ\phi \propto \frac{1}{n \, \tau}