Question

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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Answer 1

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

Answer 2

Explanation:

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