Question

how is the ressitence of a wire affected if it's radius is doubled
I need full solution​

Answer 1

Answer:

Resistance is decreased by 4 times

Explanation:

As the radius is doubled, the area also gets doubled while the resistivity and the length of the wire is constant.

R = ρL/A

Now,

R = ρL/4A

We know,

The resistance of a wire is inversely proportional to the cross sectional area of the wire.

Therefore,

R $\alpha$ 1/A

Thus,

R decreases by 4 times