2.1A piece of wire l cm long carries a current I when a voltage V is applied across its endsat a temperature of 0°C. If the resistivity of the material of which the wird is made varies asshown in the figure, what length of the same diameter wire is needed so that the same currentflows when the same voltage is applied at temperature 400°C?12108.2.012004006008001000Temperature ("C)Resistivity (10 2m)

The standard expression for the resistance of wire (R) is given as, R=ρLA Here, ρ is the resistivity…

Answered: 2.1 A piece of wire l cm long carries a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A copper wire has a length of 34.0 m and a resistance of 5.00 2 at 20.0°C. Assuming a circular cross-section, what is the wire's diameter (in mm)? The resistivity of copper at 20.0°C is 1.70 x 10-8 0 m. mm
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What is the change in a copper wire's resistivity when its temperature increases to 45°C from room temperature (20°C)? Po = 1.78 x 10-8 2•m a = 3.9 x 10-3 (1/°C)
a) Remote control is connected to a stereo by 20 m distance by using copper wire. Thiscopper wire has a resistivity of-8 1.7x10 m. What should be the diameter at the endof the wire if the resistance of wire must be less than 0.10 Ω? b) Figure 4 shows the arrangement of 3 resistors, which are connected to 3 sources: 70 V,60 V and 80 V i) Using Kirchhoff’s rules, find the current in each resistor shown in Figure 4 ii) Find the potential difference pass through R1 and R2.
A thermometer made of Platinum has a resistance of 50 N at 20 C, what is the measured temperature (in units of C) when its resistance is 78.2 N. Assume the temperature coefficient of resistivity to be a= 3.92×10-3 c-1
Silver at room temperature is found to have a resistivity of 1.59×108 №∙m. If the temperature is increased to 150°C what will be the resistivity of the silver?
Material=Nickel Resistivity=6.99 x 10^(-8) Ω.m a) Calculate the conductivity of your material. Compare the conductivity of your material with conductivity of glass having a resistivity of 3.0 x 1010 Ω.m. b) Suppose that you have a cylinder that is made of your material with a length of l=20.0 cm and a cross- sectional area of A=4.00x10-4 m2. Calculate the resistance, R, of the cylinder. c) A 9.0-V battery is connected to the cylinder that is made of your material in part-b. Using Ohm’s law calculate the current passing through the material. (V=I*R I=?)d) Suppose that the cylinder in part-b is cut into four equal pieces. Calculate the resistance of one piece of cylinder (which has a length of one fourth of the original length l) and compare your result with the originalcylinder with length l.
A certain laboratory experiment requires an aluminum wire of length of 22.0 m and a resistance of 3.50 Q at 20.0°C. What diameter wire must be used? (The resistivity of aluminum at 20.0°C is 2.82 x 10-8 Q · m.) mm Need Help? Read It
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When aluminum is used for electrical wire, it is common to use a large-diameter wire than would be necessary for copper. Compare the resistance of 16-gauge aluminum wire with that of 18-gauge copper wire of equal length by finding the ratio of their resistances. The cross-sectional area of 18-gauge wire is 0.8231 mm2, and that of 16-gauge wire is 1.309 mm2.
A certain laboratory experiment requires an aluminum wire of length of 31.0 m and a resistance of 2.80 at 20.0°C. What diameter wire must be used? (The resistivity of aluminum at 20.0°C is 2.82 x 10-8. m.) mm
How long L is a tungsten wire if it has a diameter of 0.173 x 10-3 m and a resistance of 2.77 k2? The resistivity of tungsten is 5.62 x 10-* 2-m. L =

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