Resistance of a metal wire of length 1 m is 26 ohm at 20 C .if the diameter of wire is 0.5 mm, what will be the resistivity of the metal at that temperature
Answers
Answered by
1
Answer:
resistivity =1.27*10^-6 ohm m
Answered by
3
Answer:
R=26 Ω
l=1m
d−0.3mm
r=
2
d
=
2
0.3×10
−3
=0.15×10
−3
m
A=πr
2
=3.14×(0.15×10
−3
)
2
=0.071×10
−6
m
2
R=
A
ρL
or ρ=
l
RA
=
1
26×0.071×10
−6
=1.84×10
−6
Ωm
Similar questions