Question

how is the resistance of a wire affected if (a) its length is doubled (b) its radius is doubled? Explain how?

Answer 1

if length is doubled, resistance doubles too and if radius is doubled resistance decrease by 4 times. Hope this helps.

Answer 2

$\huge \mathbb{Answer}$

In the case of Resistance :-

▶The resistance became 4 times if the length and radius is doubled.