Two wires, one of copper and other of iron, are of the same length and same radius. Which will have more resistance? Give reason.

How does the specific resistance of a semi-conductor change with the increase in temperature?

Name three factors on which resistance of a given wire depends and state how it is affected by the factors stated by you?

(a) Name two factors on which the specific resistance of a wire depends?

(b) Two wires A and B are made of copper. The wire A is long and thin while the wire B is short and thick. Which will have more specific resistance?