Question

A wire is 1m long 0.2 mm in diameter and has resistance of 10ω calculate its resistivity

Answer 1

l=1m,R=10ohms,d=0.2mm=0.0002m a=? a= R2 then,radius is half of diameter R=0.0001m a=3.14*0.0001*0.0001=3.14e-8 m2 resistivity = resistance x (area/length) resistivity=10*(3.14e-8/1) resistivity=3.14e-7 answer

Answer 2

Explanation:

length (l)=1m=100cm

diameter(d)=0.2m=20cm

radius=d/2=20/2=10

resistance=10w

area=π × r square

= (22/7)×(10) square

=(22/7)×(100)

=314.16

area=314.16

Resistivity=resistance ×(length /area)

resistivity=10 ×(100/314.16)

=3.18309142

resistivity=3.18309142

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