What happens to the drift velocity of electron and to the resistance if length of conductor and to the resistance if length of conductor unchanged?

Draw V - I graph for ohmic & non -ohmic materials. Give example.

Mention are limitation of carbon resistors.

Two wires A & B are of the same metal of the same length have area of the cross-section in the ratio of 2: 1. If the same potential difference is applied across each wire. What will be the retro of the circuit flowing in A & B?

Show variation of resistivity of
(i) conductor (i.e. copper)
(ii) semiconductor
(ii) with temperature in a graph. Give reason.