Question

List the factors by which the resistance of a wire is affected. What happens if
(a) Its Length is doubled
(b) Its Area is doubled

Answer 1

$\huge\mathfrak\red{Answer}$

Explanation:

(a) Resistance of a wire is directly proportional to the length of a wire; so if the length is doubled, resistance is also doubled.

(b) Resistance of a wire is inversely proportional to the area of cross-section the wire. Thus, if radius is doubled, area increases four times and hence the resistance becomes one-fourth.