EASY
12th ICSE
IMPORTANT
Earn 100

A wire of resistivity ρ is stretched uniformly so that its length becomes four times. What is its new resistivity? (Assume temperature of the wire remains constant during stretching of the wire). 

Important Questions on Electric Resistance and Ohm's Law

EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 19
Define temperature coefficient of resistance of the material of a conductor.  
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 20
Out of metals and metal alloys, which has greater temperature coefficient of resistance?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 16
Name two physical conditions on which the resistivity of a metal depends.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 18
Specific resistances of copper, silver and constantan are 1.18 × 10-6 Ω-cm, 1.0 × 10-6 Ω-cm and 48 × 10-6 Ω-cm respectively. Which one is best electrical conductor and why?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 21
Whether pure germanium at absolute zero temperature is a good conductor or a semiconductor or an insulator of electricity.
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 22
Is a wire carrying current charged?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 23
Although both the electron’s drift speed and the electron’s charge are very small, we can still obtain a large current in a metal. Why?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 24
A steady current is flowing in a cylindrical conductor. Is there any electric field within the conductor?