Question

Resistance increases when:

Answer 1

Answer:

a) Radius decreases

Explanation:

Resistance of any conductor is directly proportional to the length of the conductor and inversely proportional to its cross-sectional area.

So, in mathematical terms, the resistance is written as

$R$ = ρ $\frac{L}{A}$

As we know, cross sectional area is related to the radius of the conductor so if the radius of the conductor is decreased, the cross-sectional area will also decrease.

And if the cross-sectional area will decrease, the resistance will increase.

Thus decreasing the radius, increases the resistance.