Find the Resistance of a 100m long wire. If the diameter is 1mm and resistivity is 1.7×10^-8 Ohm.m.
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Answer:
R= 2.16 ohm
Explanation:
since , Resistance (R) = ro× l/A
ro = 1.7×10^(-8) ohm m
l= 100m, radius= 0.5 mm= 5×10^(-4) m
A= πr² = 3.14× 2.5×10^(-7) m²
= 7.85×10^(-7) m²
R= 1.7×10^(-8)×100 / 7.85×10^(-7)
= 1.7×10^(-8+2+7) / 7.85
=0.2165 ×10
= 2.16 ohm
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