Question

why resistance is inversely proportional to area of cross section??????

Answer 1

As the area of the cross section increases resistivity decreases and as the area of the cross section decreases resistivity increases.
Hence resistance is inversely proportional to the area of cross section.

Answer 2

why resistance is inversely proportional to area of cross section??????

Explanation:

The resistance of a conductor is said to be a measure of the opposition it offers to the flow of current. It is measured in ohms.

The resistance of a substance is said to be inversely proportional to its cross section because when the cross sectional area of the substance increases, the number of atoms and molecules that oppose the flow of current also increases which results in the decrease of resistance..