Question

(c) Electrical resistivities of some substances at 20°C are given below:
Silver
1.60 *10*12 m
Copper
1.62 * 10*12 m
Tungsten
5.20 102 m
Iron
10.0 102 m
Mercury
94.0 × 1012 m
Nichrome
100 x 10-12 m
Answer the following questions in relation to them:
(i) Among silver and copper, which one is better conductor? Why?
(i) Which material would you advise to be used in electrical heating devices? Why?​

Answer 1

Hey There! Here it is;-

(i) Among silver and copper, silver is a better conducter.

Since, resistance is inversely proportional to current, therefore, silver has less resistivity than copper, hence is a better conductor.

(ii) Alloys must be used in electrical heating devices as they don't burn readily or oxidse on heating and have higher melting and boiling points.