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A stand of wire has resistance 5.60μ Ω. Find the net resistance of 120 such strands...
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High School Teacher
The resistance of any wire is related to its length, cross-sectional area, and the material it is made of.
The general formula is : R = rho (resistivity)L/A; wher rho is resistivity and is dependent on the material, L (length), and A(cross sectional area). A = V/L
Since the wire remains the same, the resistivity and the area are constant. That means that the resistance is proportional to the length squared.
Thus, if the length is increased by a factor of 100, the resistance will also increase by a factor of 100 squared. So the new resistance will be 5.6 x 10^-2 ohms.
Posted by ndnordic on January 6, 2011 at 6:24 AM (Answer #1)
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