Question

resistance of metal wire is lenght 4m is 50 ohm at 20c. if the diameter of wire 0.5mm. what is the resistivity of wire​

Answer 1

Answer:

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=1.84×10−6Ωm

Answer 2

Answer:

resistivity= Rl/A

Explanation:

resistivity= 50×4/3.14×(0.0005)^2

=[ 100×10^8]/3.14×5

=6.37×10^8 ohm/m