Resistance of a metal wire of length 1 m ls 26 at 20°C. If the
diameter of the wire is 0.3 mm, what will be the resistivity of the
metal at that temperature? Using Table 12.2. predict the material
of the wire.
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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
−
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