calculate the resistance of a copper wire 1.0 km long and 0.50 m diameter is the resistivity of a copper is 1.7 into 10 raise to the power minus 8 ohm metre.
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Given,
L= 1 Km =1000 m=1,00,000 cm
d= 0.50 mm = 0.05 cm
∴r= d/2 = 0.025 cm
ρ= 1.7 x 10∧-8
R=(ρ.l)/a
R= ( 1.7 x 10∧-8 x 100000 ) / π (0.025)²
R= 0.865 ohm
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