Resistivity — Prelims Questions
A wire of resistance is stretched to twice its original length. Assuming its volume remains constant, what will be its new resistance and how does its resistivity change?
Which of the following materials has the highest resistivity at room temperature?
The resistivity of a semiconductor decreases with an increase in temperature because:
A wire of material X has resistance . Another wire of the same material, but with half the length and twice the cross-sectional area, will have a resistance of:
If the number density of free electrons in a conductor is doubled while the relaxation time is halved, how does its resistivity change?
A cylindrical wire has resistance . If its length is doubled and its radius is also doubled, what is its new resistance? (Assume resistivity remains constant)
Which of the following statements about resistivity is INCORRECT?