Question

What is the resistivity of a wire that has a resistence of 5 ohm ,lenth is 2m and radius of the wire is 7 mm

Answer 1

Answer:

11×10^-2ohm /m²

Explanation:

R=r.L/A

r=resistivity

R=resistance

L = length in meter

A=area in m²

radius =2pi r=2×22/7×7/1000 (1m=1000mm)

area=44×10^-3m²

R=r.L/A

5=r.2/44×10^-3=1/22×10^-3=1/22/1000=1000/22

5=r.45.45

5/45.45=r=0.11=11×10^-2ohm/m²