Question

Q4. What happens to resistance of a conductor when its area of cross section
is increased ? [1M]​

Answer 1

Answer:

Since the formula for resistance in a wire conducting electric current is

Resistance = ( (rho*length) /area))

Where rho is the resistivity of the wire and remains constant for a particular material irrespective of the length or area of cross section taken.

Here, we can clearly see that resistance is inversely proportional to the area of cross section of the conductor.

So, if we increase the area of cross section of the conductor, the resistance of the conductor decreases and vice versa.

Or, in other words when the area of cross section is increased, the surface area available for the electrons to flow increases, causing less hindrance for the electric current, thereby reducing the resistance.