Q. 8

a. Table gives the resistivity of three materials in (in Ω m) A, B, C.

Which one of them is the best conductor? And which is an insulator and why?

b. A wire of resistivity P is stretched to twice its length. What will be its new resistivity?

Answer :

a. Conductor has very low resistance in order to allow the free flow of electrons through them. Therefore Material A is the best conductor because it has the low resistivity which implies low resistance.

Insulators are the materials having high resistance. Therefore Material B is the insulator because it has the highest resistivity which implies high resistance.

b. The Resistivity of the wire will not change with the change in length. Resistivity is a property of the wire, it doesn't depend upon it’s length or cross-sectional area.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
What is Electric Current?56 mins
Understanding Short Circuit38 mins
Ohm's Law43 mins
Factors Affecting Resistance45 mins
Quiz | Most Challenging Questions on Electricity40 mins
What is Power Rating?38 mins
Quiz | Rapid Fire Round (Electricity)44 mins
Lets Understand Fleming's Left Hand Rule39 mins
Parallel combination of resistors36 mins
Genius Quiz | Electricity - Test your Speed and Accuracy38 mins
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
view all courses