Question

Resistance of a metal wire of length 1m is 0.84 ohm at 20⁰C. If the diameter of the wire is 0.2 mm, what will be the resistivity of the metal at that temperature? *​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

6

Step-by-step explanation:

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