Question

what will be the resistance if diameter is doubled keeping length and material same . please don't answer follish answer

Answer 1

Resistance is directly proportional to the length of the conductor and inversely proportional to area.

If diameter is doubled, then radius also becomes doubled. Hence area increases by twice.

=> Resistance is directly proportional to 1 / area.

=> If area is doubled, Resistance gets reduced by 1 / 2.

Hence the resistance will be half of the original resistance as the area gets doubled due to doubled diameter.

Hope it helped !