e) Given in question :
l = 1m , R = 26Ω
r = d/2
= 0.3/2
= 0.15mm
= 0.15×10-3m
We know that,
ρ = R×A/l
ρ= 1.83×10-6Ωm .
Q24. e) The resistance of a metal wire of length 1m is 26Ω at 20⸰C. if the diameter of the wire is 0.3mn, what will be the resistivity of the metal at that temperature?
Q24. e) The resistance of a metal wire of length 1m is 26Ω at 20⸰C. if the diameter of the wire is 0.3mn, what will be the resistivity of the metal at that temperature?