Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
12th Edition
ISBN: 9781259587399
Author: Eugene Hecht
Publisher: McGraw-Hill Education
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Chapter 33, Problem 24SP
To determine
Thetorque of the shunt motor when the flux density in the air gap is
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The hall effect is:
a) a potential difference inversely proportional to magnetic flux density.b) a current inversely proportional to magnetic flux density.c) a potential difference directly proportional to magnetic flux density.d) a current directly proportional to magnetic flux density.e) None of the above
Niobium metal becomes a superconductor when cooled below 9 K. Its superconductivity is destroyed when the surface magnetic field exceeds 0.100 T. In the absence of any external magnetic field, determine the maximum current a 2.00-mm-diameter niobium wire can carry and remain superconducting.
A slice of copper is 1.0mm thick and carries a current of 10A. A magnetic field of flux density 1.0T, correctly applied, produces a maximum Hall voltage of 0.6x10^-6V between the edges of the slice. Calculate the number of free charge carriers per unit volume.
Chapter 33 Solutions
Schaum's Outline of College Physics, Twelfth Edition (Schaum's Outlines)
Ch. 33 - Prob. 12SPCh. 33 - ELECTRIC GENERATORS
33.13 [II] The emf induced in...Ch. 33 - ELECTRIC GENERATORS
33.14 [II] A dynamo...Ch. 33 - ELECTRIC GENERATORS
33.15 [II] A 75.0-kW, 230-V...Ch. 33 - ELECTRIC GENERATORS
33.16 [III] A 120-V generator...Ch. 33 - ELECTRIC MOTORS
33.17 [II] A generator has an...Ch. 33 - ELECTRIC MOTORS
33.19 [II] A shunt motor with...Ch. 33 - ELECTRIC MOTORS
33.20 [II] A shunt motor is...Ch. 33 - ELECTRIC MOTORS
33.21 [II] A shunt dynamo has an...Ch. 33 - ELECTRIC MOTORS
33.22 [II] A shunt motor has a...
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- The Hall effect is to be used to find the density of charge carriers in an unknown material. A Hall voltage 40 V for 3-A current is observed in a 3-T magnetic field far a rectangular sample with length 2 cm, width 1.5 cm, and height 0.4 cm, Determine the density of the charge carriers.arrow_forwardThe density of charge carriers far copper is 8.471028 electrons per cubic meter. What will be the Hall voltage reading from a probe made up of 3cm2cm1cm ( (LWT) ) copper plate when a current of 1.5 A is passed through it in a magnetic field of 2.5 T perpendicular to the 3cm2cm .arrow_forwardA superconducting wire of diameter 0.25 cm carries a current of 1000 A. What is the magnetic field just outside the wire?arrow_forward
- (a) What is the maximum torque on a 150-tum square loop of wire 13.0 cm oil a side that carries a 50.0-A current in a 1.60-T field? (b) Wliat is the torque when d is 10.9s?arrow_forwardIntegrated Concepts One long straight wire is to be held directly above another by repulsion between 1heir currents. The lower wire carries 100 A and the wire 7.50 cm above it is 10gauge (2.588 mm diameter) copper wire. (a) What current must flow in the upper wire, neglecting the Earth’s field? (b) What is the smallest current if the Earth’s 3.00105T field is parallel to the ground and is not neglected? (c) Is the supported wire in a stable or unstable equilibrium if displaced vertically? If displaced horizontally?arrow_forwardExplain why B=0 inside a long, hollow copper pipe that is carrying an electric current parallel to the axis. Is B=0 outside the pipe?arrow_forward
- The Hall effect is to be used to find the sign of charge carries in a semiconductor sample. The probe is placed between Own poles of a magnet so that magnetic field Is pointed up. A current is passed through a rectangular sample placed horizizontally. As current is passed through the sample in the east direction, the north side of the sample is found to be at a higher potential than the south side. Decide if the number density of charge carriers is positively or negatively charged.arrow_forwardA length of copper wire carries a current of 15 A, uniformly distributed through its cross section. Calculate the energy density of (a) the magnetic field and (b) the electric field at the surface of the wire. The wire diameter is 3.0 mm, and its resistance per unit length is 3.5 Ω/km.arrow_forwardIn the figure, a wire loop formed from 0.1 cm radius copper wire with side lengths of 20 cm x 80 cm. is seen. The short edge of the wire is in the 3×10^-2 T magnetic field region perpendicular to the page plane with a speed of 0.8 m/s entered and is on its way. Always outside the magnetic field region of the other short edge Assume it remains. How many Amps is the current in the loop? (Copper resistivity: 1.68x10" ohm.m) A) 0.45 B) 0.25 C) 0.35 D) 0.05 E) 0.15arrow_forward
- 1. A typical current in a lightning bolt is 10^4 A. Estimate the magnetic field 1 m from the bolt. This is not and will not be gradedarrow_forwardOne long straight wire is to be held directly above another by repulsion between their currents. The lower wire carries 100 A and the wire 7.50 cm above it is 10-gauge (2.588 mm diameter) copper wire. (a) What current must flow in the upper wire, neglecting the Earth’s field? (b) What is the smallest current if the Earth’s 3.00×10−5 T field is parallel to the ground and is not neglected? (c) Is the supported wire in a stable or unstable equilibrium if displaced vertically? If displaced horizontally?arrow_forwardYou are given a hollow copper cylinder with inner radius a and outer radius 3a. The cylinder's length is 200a and its electrical resistance to current flowing down its length is R. To test its suitability for use in a circuit, you connect the ends of the cylinder to a voltage source, causing a current I to flow down the length of the cylinder. The current is spread uniformly over the cylinder's cross section. You are interested in knowing the strength of the magnetic field that the current produces within the solid part of the cylinder, at a radius 2a from the cylinder axis. But since it's not easy to insert a magnetic-field probe into the solid metal, you decide instead to measure the field at a point outside the cylinder where the field should be as strong as at radius 2a. Part A At what distance from the axis of the cylinder should you place the probe?arrow_forward
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