Question

. If the length of a given conducting wire is
kept constant and its diameter is doubled,
what will be the resistance of the new wire ?​

Answer 1

Answer:

Resistivity is depending on material of wire, and as material of wire is not changing resistivity will not change.

Their is no mention about change in length of wire, so Length of wire is same.

While considering area (cross sectional area of wire), it is inversely depending on Radius Square

So as Resistance inversely proportional to Radius Square, when Radius is 2 times then Resistance is 1/2² or 1/4