Question

If radius of a metallic wire becomes n times its resistance becomes-
(a) n^2 times (b) (1/n^2) times (c)n^4 times (d) (1/n^4)
Send the procedure.

Answer 1

Answer:

b)1/n^2 times

Explanation:

R=P.L/A=P.L/πr^2

R'=P.L/πn^2r^2=R/n^2 (Ans)