sequence of potential differences V is applied across a
Chapter 18, Problem 62GP(choose chapter or problem)
A sequence of potential differences V is applied across a wire (diameter = 0.32 mm, length = 11 cm) and the resulting currents I are measured as follows:
(a) If this wire obeys Ohm’s law, graphing I vs. V will result in a straight-line plot. Explain why this is so and determine the theoretical predictions for the straight line’s slope and y-intercept. (b) Plot I vs. V. Based on this plot, can you conclude that the wire obeys Ohm’s law (i.e., did you obtain a straight line with the expected y-intercept, within the values of the significant figures)? If so, determine the wire’s resistance R. (c) Calculate the wire’s resistivity and use Table 18–1 to identify the solid material from which it is composed.
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