Passage III

Tables 1 and 2 summarize information about the resistance of some 1-meter (m)-long aluminum and copper wires, respectively, that have different diameters. The resistance of a wire (reported in ohms) restricts the flow of electrons through the wire and results in the.conversion of electrical energy to heat. Table 3 reports the resistance, in ohms, of different lengths of 0.10-mm-diameter aluminum wire at 20°C.

14. Based on the information in Table 3, one would predict that a 20-m length of aluminum wire with a 0.10-mm diameter would have a resistance of:

Answer and Explanation

Your Answer is

Correct Answer is J

Explanation

It can be seen from table 3 that the resistance is proportional to the length of the wire. Therefore, the resistance of the 20 m wire given in the question stem should be equal to twice the resistance of the 10 m wire, that is, 35.5×2=71 ohms