Answer :

Resistor is heated due to the current flowing through it. Thermal energy is increase.

Formula used :



Where i current


A area of the cross section


n electrons per unit area.


Drift speed



R resistance


ρ resistivity


l length


A area of cross section


If thermal energy is increase the resistance will increase. Resistance is directly proportional to resistivity, so resistivity also increase. Increase in resistance leads to decrease in current. Current is directly proportional to drift velocity. So drift speed. So only the number of electrons remains same.


If the resistor connected to a battery is heated due to current flowing through it the drift speed, resistance, resistivity all are change except number of free electrons. Option D is correct.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

(a) Define Physics - Board Papers

(a) Consider circPhysics - Exemplar

Two conductors arPhysics - Exemplar

The relaxation tiPhysics - Exemplar

Why are alloys usPhysics - Exemplar

Electrons are emiHC Verma - Concepts of Physics Part 2

What is relaxatioPhysics - Exemplar