temperature
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Short Answer Type Questions
14. () What do you understand by the resistivity of a substance ?
) A wire 10 m lang 0.2 men in diameter and has a resistance of 10 Calculate the resistivity
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14) (I) The resistivity of a substance is the resistance of a cube of that substance having edges of unit length, with the understanding that the current flows normal to opposite faces and is distributed uniformly over them. ... The SI unit of electrical resistivity is the ohm⋅metre (Ω⋅m)
(ii)Given,
l=0.1m=1000mm
d=0.2mm∴radius(r)=
2
0.2
=0.1mm
R=10Ω
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