Question

resistance of a metal wire of length 1m is 26ohmi if the diameter of the metal at that temperature using table 12.2 predict the meterial of the wire?​

Answer 1

Explanation:

R=26 Ω

l=1m

d−0.3mm

r=2d=20.3×10−3=0.15×10−3m

A=πr2=3.14×(0.15×10−3)2=0.071×10−6m2

R=AρL

or ρ=lRA=126×0.071×10−6=1.84