Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN: 9781133939146
Author: Katz, Debora M.
Publisher: Cengage Learning
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Chapter 28, Problem 32PQ
To determine
The plot of resistivity versus temperature and the temperature coefficient of resistivity value from the plot then identification of the material from the Table 28.2.
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What is the maximum value in the tolerance range of a resistor with color code blue-gray-green-silver?
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A long wire with a radius of 0.400 cm carries a current. The potential difference across a 3.60 m long section of this wire is 12.0 V, and the wire carries a current of 0.370 A.
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A photoresistor, whose resistance decreases with light intensity, is connected in the circuit as shown. On a sunny day, the photoresistor has a resistance of 0.56 kΩ. On a cloudy day, the resistance rises to 4.0 kΩ. At night, the resistance is 20 kΩ.a. What does the voltmeter read for each of these conditions?b. Does the voltmeter reading increase or decrease as the light intensity increases?
Chapter 28 Solutions
Physics for Scientists and Engineers: Foundations and Connections
Ch. 28.1 - Prob. 28.1CECh. 28.2 - Prob. 28.2CECh. 28.3 - Prob. 28.3CECh. 28.5 - When a lightbulb burns out, its filament breaks so...Ch. 28.6 - A battery with terminal potential is connected to...Ch. 28.7 - A battery of terminal potential is connected to a...Ch. 28 - Prob. 1PQCh. 28 - Prob. 2PQCh. 28 - Prob. 3PQCh. 28 - Prob. 4PQ
Ch. 28 - Prob. 5PQCh. 28 - Prob. 6PQCh. 28 - Prob. 7PQCh. 28 - Prob. 8PQCh. 28 - Prob. 9PQCh. 28 - Prob. 10PQCh. 28 - Prob. 11PQCh. 28 - Prob. 12PQCh. 28 - Prob. 13PQCh. 28 - Prob. 14PQCh. 28 - The current in a wire varies with time (measured...Ch. 28 - Prob. 16PQCh. 28 - The amount of charge that flows through a copper...Ch. 28 - Prob. 18PQCh. 28 - Prob. 19PQCh. 28 - Prob. 20PQCh. 28 - Prob. 21PQCh. 28 - Prob. 22PQCh. 28 - A copper wire that is 2.00 mm in radius with...Ch. 28 - Prob. 24PQCh. 28 - Prob. 25PQCh. 28 - Prob. 26PQCh. 28 - What is the electric field in an aluminum wire if...Ch. 28 - Prob. 28PQCh. 28 - Prob. 29PQCh. 28 - Prob. 30PQCh. 28 - Prob. 31PQCh. 28 - Prob. 32PQCh. 28 - Two concentric, metal spherical shells of radii a...Ch. 28 - Prob. 34PQCh. 28 - Prob. 35PQCh. 28 - Prob. 36PQCh. 28 - Prob. 37PQCh. 28 - A lightbulb is connected to a variable power...Ch. 28 - Prob. 39PQCh. 28 - Prob. 40PQCh. 28 - Prob. 41PQCh. 28 - Prob. 42PQCh. 28 - Prob. 43PQCh. 28 - A Two wires with different resistivities, 1 and 2,...Ch. 28 - A copper and a gold wire are supposed to have the...Ch. 28 - Gold bricks are formed with the dimensions 7358134...Ch. 28 - Prob. 47PQCh. 28 - Prob. 48PQCh. 28 - Prob. 49PQCh. 28 - Prob. 50PQCh. 28 - Prob. 51PQCh. 28 - Prob. 52PQCh. 28 - Prob. 53PQCh. 28 - Prob. 54PQCh. 28 - A two-slice bread toaster consumes 850.0 W of...Ch. 28 - Prob. 56PQCh. 28 - Prob. 57PQCh. 28 - Prob. 58PQCh. 28 - Prob. 59PQCh. 28 - Prob. 60PQCh. 28 - Prob. 61PQCh. 28 - Prob. 62PQCh. 28 - Prob. 63PQCh. 28 - Prob. 64PQCh. 28 - Prob. 65PQCh. 28 - Prob. 66PQCh. 28 - Prob. 67PQCh. 28 - Prob. 68PQCh. 28 - Prob. 69PQCh. 28 - Prob. 70PQCh. 28 - Prob. 71PQCh. 28 - Prob. 72PQCh. 28 - Prob. 73PQCh. 28 - Prob. 74PQCh. 28 - Review When a metal rod is heated, its resistance...Ch. 28 - Prob. 76PQCh. 28 - Prob. 77PQCh. 28 - Prob. 78PQCh. 28 - Prob. 79PQCh. 28 - Prob. 80PQCh. 28 - Prob. 81PQCh. 28 - A conducting material with resistivity is shaped...
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- A regular tetrahedron is a pyramid with a triangular base and triangular sides as shown in Figure P28.73. Imagine the six straight lines in Figure P28.73 are each 10.0- resistors, with junctions at the four vertices. A 12.0-V battery is connected to any two of the vertices. Find (a) the equivalent resistance of the tetrahedron between these vertices and (b) the current in the batten.arrow_forwardA long wire with a radius of 0.400 cm carries a current. The potential difference across a 3.40 m long section of this wire is 15.0 V, and the wire carries a current of 0.450 A. (a) What is the resistance (in Ω) of the 3.40 m long section of wire? Ω (b) What is the resistivity (in Ω · m) of the wire? Ω· marrow_forwardA material of resistivity ρ is formed into the shape of a truncated cone of height it as shown in Figure P27.85. The bottom end has radius b, and the lop end has radius a Assume the current is distributed uniformly over any circular cross section of the cone so that the current density does not depend on radial position. (The current density docs vary with position along the axis of the cone.) Show that the resistance between the two ends isarrow_forward
- (a) Find the equivalentresistance between pointsa and b in Figure P18.7.(b) Calculate the currentin each resistor if a potentialdifference of 34.0 V isapplied between points aand b.arrow_forwardWhat is the maximum value in the tolerance range of a resistor with color code red-violet-orange-gold? Select one: a. 27 kΩ b. 32.4 kΩ c. 28.35 kΩ d. 29.7 kΩarrow_forwardWire C and wire D are made from different materials and have length LC = LD = 3.1 m. The resistivity and diameter of wire C are 3.3 × 10-6 Ω·m and 1.03 mm, and those of wire D are 1.2 × 10-6 Ω·m and 0.72 mm. The wires are joined as shown in the figure and a current of 2.6 A is set up in them. What is the electric potential difference between (a) points 1 and 2 and (b) points 2 and 3? What is the rate at which energy is dissipated between (c) points 1 and 2 and (d) points 2 and 3?arrow_forward
- Consider a resistor made from a hollow cylinder of carbon as shown below. The inner radius of the cylinder is Ri = 0.20 mm and the outer radius is R0 = 0.30 mm . The length of the resistor is L = 0.90 mm . The resistivity of the carbon is ρ = 3.5 × 10−5 Ω · m . (a) Prove that the resistance perpendicular from the axis is R = ρ 2πLln ( R0 Ri). (b) What is the resistance?arrow_forwardA copper wire has a diameter of 2.0 mm and a length of 3.0 m. It carries acurrent of 6.3 A. The density of free electrons in copper is 8.5×1028electrons per cubic meter and resistivity of copper is 1.7×10-8Ω.m.a) What is the current density in the wire?b) What is the resistance of the wire?c) What is the electric field in the wire?d) What is the drift velocity of free electrons? Or calculatethe drift velocity of free electrons (or find the drift velocity of freeelectrons)e) Find the power dissipated as heat in the wirearrow_forwardA current I =0.35 A flows through a cylindrical resistor made out of some unknown ceramic-like composite. The radius of the cylindrical body is 4.25 mm while the length is 1.65 cm. If the potential drop over the resistor is 7.54 V, what is the resistivity of the unknown ceramic material? (Answer in Ohm*m)arrow_forward
- A long wire with a radius of 0.400 cm carries a current. The porential difference across a 3.60 m long section of this wire is 12.0 V, and the wire carries a current of 0.370 A. a. What is the resistance of the 3.60 m long section of wire? b. What is the resistivity of the wire?arrow_forwardKiting during a storm. The legend that Benjamin Franklin flew a kite as a storm approached is only a legend — he was neither stupid nor suicidal. Suppose a kite string of radius 2.10 mm extends directly upward by 0.802 km and is coated with a 0.520 mm layer of water having resistivity 155 Ω·m. If the potential difference between the two ends of the string is 176 MV, what is the current through the water layer? The danger is not this current but the chance that the string draws a lightning strike, which can have a current as large as 500 000 A (way beyond just being lethal).arrow_forwardA lightning rod on top of a building consists of an iron spike 1.5 m long with a circular crosssection of diameter 1.5 cm. During a lightning strike, the rod carries a current of 1000 A. What is the potential difference across the rod when this current flows? The resistivity of iron is 1.0 x 10-7 Ωm.arrow_forward
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