Question

calculate the resistance of 1km long copper wire of radius 1mm resistivity of copper is 1.72×10-8 ohns m

Answer 1

Answer :

Length of copper wire ( l ) = 1km
= 1000m

Radius of copper wire ( r ) = 1mm
= 1× 10^-3 m
= ( 1 × 10 to the
power -3 )

Resistivity of the copper wire ( p ) = 1.72 × 10^-8
Wm
Area of cross section ( A ) = π × r^2
= 3.14 × 10^-3 × 10^-3
= 3.14 × 10^-6 m^2
Resistance of copper wire = pl / A
= ( 1.72×10^-8 × 1000 ) /
( 3.14 × 10^-6 )
= 5.5 ohms

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Answer 2

Answer:

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Explanation:

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