Question

Resistance of a metal waire of length 1m is 26Ω at 20°C. If the diameter of the wire is 0.3mm. What will be the resistavity of the metal at that temperature?

Answer 1

Answer:

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Explanation:

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Answer 2

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