Question

The radius of conducting wire is doubled what will be the ratio of its new resistivity to the old one

Answer 1

Answer:Take out resistivity from the resistance formulae and then follow.

Explanation:

Answer 2

If specific resistance is P

P = RA/L

P = πr^2R/L

P1/P2 = (r1/r2)^2

P1/P2 = (r/(2r))^2

P1/P2 = 1/4

P2 = 4P1

P2/P1 = 4/1

Ratio of its new specific resistance to the old one is 4 : 1

"HOPE IT HELPS YOU"

"MARK ME AS BRAINLIST"

⭐⭐⭐⭐⭐