Question

how does tue resistance of a wire vary with it's cross-section area

Answer 1

Resistance and area of cross section are inversely proportionate. As resistivity increases area decreases and as area increases, resistivity decrease..

Answer 2

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.