Home Physics Current Electricity Telangana & AP CET Previous Year Question Identify the correct statement among the fol…
Physics Current Electricity Telangana & AP CET Previous Year Question MCQ (Single Correct)

Identify the correct statement among the following:

A
Resistivity of metals decreases with temperature because more electrons are available for conduction.
B
Resistivity of metals increases with temperature because number of electrons decreases.
C
Resistivity of metals increases with temperature because number of collisions between electrons increases
D
Resistivity of metals decreases with temperature because superconductivity sets in.

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The correct answer is:
C

The resistivity of a metal is given by

[Because as temperature increases collision frequency increases]
So, on decreases, resistivity ' ' increases.

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