Question

How does the resistance of a wire vary with its area of cross section?
Plzz do it fast

Answer 1

Resistance is inversely proportional to area of cross section. larger will be the area lower will be the resistance and vice versa. this is because through a conductor with large area of cross section current can easily flow and hence resistance is low.

Answer 2

Resistance =

$r \: = \beta l \div a$

That is not Beta that is Ro,

resistance is inversly proportional to area of cross section

$r \alpha 1 \div a$