2) Phineas and Ferb decided to study resistivity by measuring the resistance of coils. They plotted the following resistance vs. length graph by measuring the resistance of several coils of varying lengths with a voltmeter. Use the slope of the graph to determine the resistivity of the material. Assume the diameter of the wire is 0.2 mm Answer: p= 4.67 x 10-7 m Resistance (0) 35 30 25 20 15 10 5 0 0 Resistance vs. Length 0.5 y 14.875x+1.41 Length (m) 1.5
2) Phineas and Ferb decided to study resistivity by measuring the resistance of coils. They plotted the following resistance vs. length graph by measuring the resistance of several coils of varying lengths with a voltmeter. Use the slope of the graph to determine the resistivity of the material. Assume the diameter of the wire is 0.2 mm Answer: p= 4.67 x 10-7 m Resistance (0) 35 30 25 20 15 10 5 0 0 Resistance vs. Length 0.5 y 14.875x+1.41 Length (m) 1.5
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Transcribed Image Text:2) Phineas and Ferb decided to study resistivity by measuring the resistance of coils. They plotted the
following resistance vs. length graph by measuring the resistance of several coils of varying lengths with
a voltmeter. Use the slope of the graph to determine the resistivity of the material. Assume the diameter
of the wire is 0.2 mm
Answer: p= 4.67 x 10-7 Qm
Resistance (0)
35
30
25
20
15
10
5
0
0
Resistance vs. Length
0.5
y = 14.875x + 1.41
Length (m)
1.5
2
(b) Dr. Doofenshmitz had a 10 9 resistor made of the material in part a. The temperature of the room is
20 degrees Celsius. In order to take over the Tri-State area he needs a 15 Q2 resistor. Unfortunately he
does not have a 15 9 resistor but he gets the genius idea to adjust the resistance of the resistor by
changing the temperature. What temperature would be required to make the 10 92 resistor a 15 9 resistor?
Assume anichrome = 4 x 104/°C.
Answer: T = 1270 °C
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