Calculate the resistance of a copper wire 1.0 km long and 0.50 mm diameter if the resistivity of copper is 1.7×10^-8 Ω m.

What will be the resistance of a metal wire of length 2 metres and area of cross-section 1.55 x 10^-6 m², if the resistivity of the metal be 2.8 x 10^-8 Ω m ?

Give two examples of substances which are good conductors of electricity. Why do you think they are good conductors of electricity?

Will current flow more easily through a thick wire or a thin wire of the same material when connected to the same source? Give reason for your answer.

How does the resistance of a conductor depend on :

(a) length of the conductor?

(b) area of cross-section of the conductor?

(c) temperature of the conductor?