Two resistances have lengths in the ratio 1:4 and radius 1:2,specific resistances in ratio 3:1. compare their resistances.
Solution)
Given lengths l1=1
l2=4
Given radius r1=1
r2=2
Given specific resistances Ρ(rho)1=3
Ρ2= 1
we know the R=Ρl/A
R1/R2=3/1.