Resistance of metal wire of length 1 m is 26 ohm at 20°C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature?
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[tex]give \: a \: brief \: solution[/tex]
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Answer:
ANSWER
R=26 Ω
l=1m
d= −0.3mm
r= 2/d
= 20.3×10 ^−3/2
=0.15×10 ^−3 m
A=πr ^2
=3.14×(0.15×10 ^−3 ) ^2
=0.071×10 ^−6 m ^2
R= ρL/A
or ρ= lR/A
= 26×0.071×10 ^−6/1
=1.84×10 ^−6 Ωm
The answer is =1.84×10 ^−6 Ωm
Explanation:
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