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Question

The electrical resistivities of five substances A, B, C, D and E are given below:
A 5.20 × 10−8 Ω m
B 110 × 10−8 Ωm
C 2.60 × 10−8 Ωm
D 10.0 × 10−8 Ωm
E 1.70 × 10−8 Ωm

(a) Which substance is the best conductor of electricity? Why?
(b) Which one is a better conductor : A or C? Why?
(c) Which substance would you advice to be used for making heating elements of electric iron? Why?
(d) Which two substances should be used for making electric wires? Why?

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Solution


(a) E is the best conductor of electricity because its resistivity is the least among the given values.
(b
) C
is a better conductor than A because its resistivity is less than that of A.
(c) B should be used for making heating elements of electric iron because its resistivity is the highest among the given values.
(d) E and C should be used for making electric wires because their resistivity is less.

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