Theory and Design for Mechanical Measurements
Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Chapter 11, Problem 11.7P

A conductor made of nickel (p, = 6.8 x 10-8 Q m)
has a rectangular cross section 5x2 mm and is 5 m long. Determine the total resistance of this conductor. Calculate the diameter of a 5-m-long copper wire that has a circular cross section that yields the same total resistance.

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Determine the resistance of an aluminium coil of 1.3 cm as diameter consists of 13100 turns and the mean length per turn is 44 cm. Take the electrical resistivity aluminium coil as 0.017 μΩ–m. The area in cm2  = The total length in m = The resistance of the coil in Ω =
A copper conductor has a resistance of 80 Ω at room temperature. If resistance temperature coefficient of copper 0.003899 (1/˚C). Calculate the resistance if the temperature is increased to 75˚C.
A rod of semiconducting material of lenght L=3 m and cross-sectional area A=4.5 mm^2 lies along the x-axis between x=0 and x=L. The material obeys ohm's law, and resistivity varies along the rod according to p=p0 (1-(x^2/L^2)) where p0= 4.10^-4 ohm.m. The end of the rod x=0 is at a potential V0=30V greater than the x=L. A) what is the total resistance, in units of ohm, of the rod? B) what is the current, in units of miliamperes, in the rod?  C) what is the electric potential, in units of Volt, in the rod at x=L/2? D) what is the electic-field magnitude E, in units of V/m, in the rod at x=L/2?

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