Please explain the following 22nd question with reason.

Dear Student,
The resistance of a conductor is given by:
R = ml/ne2τA
where, m = mass of electron
l = length of resistance wire
n = number of electrons
τ = relaxation time
e = charge on electron 
A = area of cross section 
From the relation it is clear that resistance (R) of metal wire is inversely proportional to relaxation time (τ).
Hence, to increase the resistance of metal wire with increasing temperature we should decrease the relaxation time (option b).


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