Question

how does the resistance of a wire vary with its area of cross section​

Answer 1

Resistance of a wire is inversely proportional to its area of cross section, i.e., when area of cross section increases the resistance decreases or vice versa.

Answer 2

Answer:

The resistance of a conductor is inversely proportional to its area of cross section. A dummy approach:

• The concept of current flow in a conductor is analogous to liquid flow in a pipe.
• As the amount of current flowing at constant voltage increases with increase in cross sectional area, resistance decreases.