Question

resistance of a metal wire of length 1m is 26ohm at 20degree C. if the diameter pf the wire is 4m. what will be the resistivity of the metal at that temperature​

Answer 1

Answer:

Resistivity = 31*10^-5 ohm meter

Explanation:

Resistance = 26 ohm

length = 1m

Diameter = 4m

Radius = 2 m

Ar. of cross section = π*r^2 = 3.14*2*2 = (314/25)

we know that ,

R = e*L/A

= e*L/A e = L/A*R

= e*L/A e = L/A*R e = 1/ (314/25)*26

= e*L/A e = L/A*R e = 1/ (314/25)*26 e = 25/ 314*26

e = 25/ 8164

e = 0.00306

e = 306* 10^ -5 ohm meter

e = 31*10^-5 ohm meter