Calculate the resistance of a copper wire of length
I mand area of cross section 2 mm. Resistivity of
copper is 1.7 x 10.2 m.
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Explanation:
length of war is 1 m ( l ),
area of cross section is 2mm^2
=2×10^-6 m^2 ( a^2 )
resistivity of copper is 1.7×10^-8 ohm m( ¶ )
If resistance is R , we know
R=¶ × l / a^2
=1.7×10^-8 × 1 / 2×10^-6
=1.7 × 10^-8 ×10^6 /2
=1.7 × 10^-2 /2
=.0085 ohm
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