Question

Answer the following :

A) What will be the resistance of a metal wire of length 2 metres and area of cross section 1.55×10^-6m², If the resistivity of the metal be 2.8×10^-8 ohm-metre?

B) How does the presence of impurities in a metal affect it's resistance?

C) What happens to the resistance as the conductor is made thinner?

Answer 1

C) As conductor is made thinner the area of cross scetion decreases. Since resistance is inversely proportional to area of cross section, resistance increases as the conductor becomes thinner. Please do ask other questions in a separate mail so that we can help you better