Ppa6 concep tests_ch_21
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This document contains a series of conceptual tests about magnetic flux and induced currents based on textbook material. It includes diagrams and explanations of the direction of induced currents in different scenarios involving moving magnets and wire loops in magnetic fields.
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![ConcepTest 21.1a Magnetic Flux I ,[object Object],1) drop the magnet 2) move the magnet upwards 3) move the magnet sideways 4) only (1) and (2) 5) all of the above](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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1) Torque is produced in an induction motor due to the interaction between the rotating stator flux and currents induced in the rotor coils.
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3) The currents in the rotor coils interact with the rotating stator flux to produce a torque that tends to rotate the rotor in the same direction as the stator flux.
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1. Michael Faraday discovered electromagnetic induction in 1831 when he found that a changing magnetic field can generate an electric current.
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- If a magnetic field is changing with time, it will induce an electric field. The direction of the induced electric field is such that it opposes the change producing it.
- Lenz's law gives the direction of the induced current/electric field in terms of trying to oppose the change in magnetic flux that caused it.
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Walmart Business+ and Spark Good for Nonprofits.pdf
"Learn about all the ways Walmart supports nonprofit organizations.
You will hear from Liz Willett, the Head of Nonprofits, and hear about what Walmart is doing to help nonprofits, including Walmart Business and Spark Good. Walmart Business+ is a new offer for nonprofits that offers discounts and also streamlines nonprofits order and expense tracking, saving time and money.
The webinar may also give some examples on how nonprofits can best leverage Walmart Business+.
The event will cover the following::
Walmart Business + (https://business.walmart.com/plus) is a new shopping experience for nonprofits, schools, and local business customers that connects an exclusive online shopping experience to stores. Benefits include free delivery and shipping, a 'Spend Analytics” feature, special discounts, deals and tax-exempt shopping.
Special TechSoup offer for a free 180 days membership, and up to $150 in discounts on eligible orders.
Spark Good (walmart.com/sparkgood) is a charitable platform that enables nonprofits to receive donations directly from customers and associates.
Answers about how you can do more with Walmart!"
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Ppa6 concep tests_ch_21
- 1. © 2005 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their courses and assessing student learning. Dissemination or sale of any part of this work (including on the World Wide Web) will destroy the integrity of the work and is not permitted. The work and materials from it should never be made available to students except by instructors using the accompanying text in their classes. All recipients of this work are expected to abide by these restrictions and to honor the intended pedagogical purposes and the needs of other instructors who rely on these materials. ConcepTest PowerPoints Chapter 21 Physics: Principles with Applications, 6 th edition Giancoli
- 14. ConcepTest 21.3c Moving Wire Loop III 1) clockwise 2) counterclockwise 3) no induced current What is the direction of the induced current if the B field suddenly increases while the loop is in the region? x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
- 15. ConcepTest 21.3c Moving Wire Loop III 1) clockwise 2) counterclockwise 3) no induced current What is the direction of the induced current if the B field suddenly increases while the loop is in the region? The increasing B field into the page must be countered by an induced flux out of the page . This can be accomplished by induced current in the counterclockwise direction in the wire loop. Follow-up: What if the loop stops moving while the field increases? x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
Editor's Notes
- [CORRECT 5 ANSWER]
- [CORRECT 5 ANSWER]