Question

Calculate the resistivity of the material of the wire of length 2.0m, diameter 1.0mm having 50 ohm resistance
Plxx ans me
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Answer 1

Acc. to me,

You know all wire is circular area of cross section so

[Resistance(R)=Resistivity(Row)*L/A]

R=50ohm

Row=?

L=2m

Diameter=1mm----you see it is in mm and length in m so first change it to m

1mm=0.001m

So from diameter(d=2r---r=d/2) find area

Area =pie*r²

Area=3.14*(d/2)²

A=3.14*0.00000025

A=0.000000785m²

Put in formula

50=Row*2/0.000000785

Row=50*0.000000785/2

Row=0.000019625Ohm meter

I hope it help

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