Faraday Law Supplementary.Doc Essay

4066 words - 17 pages

Workshop: Using Visualization in Teaching Introductory E&M
AAPT National Summer Meeting, Edmonton, Alberta, Canada.
Organizers: John Belcher, Peter Dourmashkin, Carolann Koleci, Sahana Murthy

Faraday’s Law Supplementary Materials

Visualizations

You can find more visualizations at Faraday Law Visualizations. We highlighted two of the visualizations below that complement the workshop activity.

Magnet falling Through a Ring with Zero Resistance show an example of Faraday's Law, as a magnet is dropped through a conducting ring. As the magnet falls under gravity, a current is induced in the ring that tries to keep the magnetic flux through the area of the ring constant. This ...view middle of the document...

If the resistance of the ring is zero, the change in induced flux in the ring will exactly counter the change in external flux due to the external field, thus keeping the total flux constant. Increasing the resistance hinders the flow of induced current, resulting in a delay in the response of the ring to the change in external flux, and a corresponding change in total flux. This can be seen in the flux graph as you manipulate the parameters.

ConcepTests

The following ConcepTests illustrate various aspects of Faraday’s Law. They can be used both in class and on exams.

Wire loop in an Increasing Magnetic Field

The magnetic field through a wire loop is pointed upwards and increasing with time. The induced current in the coil is

1. clockwise as seen from the above.
2. counterclockwise as seen from the above.
3. zero.
4. not sure.

Answer: 1. Current is clockwise as seen from above looking down. This direction will produce an “induced” B field generated by the current in the coil that points downward over the area of the wire loop. This “induced” B field is trying to offset the increasing external magnetic field through the wire loop. (Lenz’s Law—the system reacts to try to keep things the same). Note we are ignoring the effects of self induction.

Wire Loop in a Decreasing Magnetic Field

The magnetic field through a circular wire wire loop is pointed upwards and decreasing with time. The induced current in the coil is

1. clockwise as seen from the above.
2. counterclockwise as seen from the above.
3. zero.
4. not sure.

Answer: 2. The current is counterclockwise as seen from above. This direction will produce an “induced” B field generated by the current in the coil that points upward over the area of the wire loop. This “induced” B field is trying to offset the decreasing magnetic field upwards through the wire loop. (Lenz’s Law—the system reacts to try to keep things the same). Note we are ignoring the effects of self induction.

Current and Force on a Wire Loop Moving Through a Changing Magnetic Field A wire loop moves up from underneath a magnet with its north pole pointing upward. Which of the following choices best describes the current in the wire loop as seen from above and the force on the wire loop?

1. Current clockwise and force up.
2. Current counterclockwise and force u p.
3. Current clockwise and force down.
4. Current counterclockwise and down.
5. Not sure.
Answer: 3. The current is clockwise as seen from above and the force is down

The clockwise current implies a self-field of the current in the wire loop that is downward, trying to offset the increase of magnetic flux upwards through the wire loop as it moves upward into a stronger external magnetic field originating from the magnet (Lenz’s Law). The force on the wire loop is a force which is trying to keep the flux through the wire loop from...

Other Essays Like faraday_law_supplementary.doc

The French And Indian War: The "Real" First World War

1955 words - 8 pages The Seven Years War, or more commonly referred to as “The French and Indian War”, has been called the true First World War. In this book The French and Indian War: Deciding the Fate of North America, the author and historian Walter R. Borneman paints a detailed and elaborate picture that justifies the claim of it being the first true war of global proportions. If ever there truly was a climax to the never ending feud of the European powers

Is The Use Of Animals In Medical Research A Necessary Measure?

1513 words - 7 pages Throughout history, animals have been used in experiments to test product safety and obtain medical knowledge that benefits both humans and animals alike. Every year there are numerous medical breakthroughs, such as medications and surgical instruments, which are tested on animals to insure their safety before they are deemed acceptable for human use. Even though the results of the experiments saved millions of human lives, they are also

Education And The Evolving Job Market

2363 words - 10 pages The lives of students today are changing. They are preparing for lives and jobs that have never before existed. If teachers hope to have a significant and worthwhile impact on these quickly changing lives, they must change the way they think, prepare, and instruct our future generations. Children cannot afford to have teachers who remain stagnant in their methods and ideals. Students crave instructors that are willing to allow them to tap

Young And Relentless

1737 words - 7 pages There are numerous influences that can be responsible of teenager’s behaviors and attitude as they develop. One factor that is important to these behaviors is parental figures being over involved or uninvolved in their children’s lives. Many of these effects include illegal substance abuse, rising sexual activity, underage alcohol consumption, and tobacco use. Studies show parental participation plays a key role in the characteristics developed

The Natural Law Theory

1231 words - 5 pages Obeying by the natural law theory is the only true and moral way to live life; especially a life lived in God’s image. God’s presence is a guiding factor to obtaining a moral and virtuous life, which can only be obtained by following the natural law theory. God created a set of laws as a supreme guide for humans to live life, like any law these laws were created to ensure wellbeing for everyone. The laws he created are the civil law, the natural

Resolved: Presidential Signing Statements Threaten To Undermine The Rule Of Law And The Separation Of Powers

1811 words - 8 pages The subject of signing statements has created much debate among the houses of Congress, government officials, and the public alike. These signing statements fall under the categories of constitutional and legislative history signing statements. Constitutional signing statements are those in which the president deems certain provisions of the legislation as unconstitutional, therefore they should not be enforced (Bradley & Posner, 2006

Oppressive Systems Of Government In Egypt And Animal Farm

1529 words - 7 pages As in Egypt, Orwell demonstrates through his allegorical novel “Animal Farm” that leaders are able to establish and maintain power over a people, and in turn create an oppressive and corrupt government system. Orwell shows the significant difference in the education and levels of knowledge in the animals, and how the government takes advantage of this difference. The split between the levels of intelligence is portrayed in the first chapter when

The Pathway To Psychosis

1415 words - 6 pages “How all occasions do inform against me” is a line from act IIII, scene IIII of William Shakespeare’s Hamlet. This line, spoken by Hamlet, expresses his emotional state as he is currently overwhelmed by the death of his father, the king of Denmark, and the situation surrounding it. After Hamlet learns of his father’s death he finds out that his mother has married Claudius, Hamlet’s uncle. On top of all of that, Hamlet soon after

Rated “M” For “More Censorship Not Needed”

1241 words - 5 pages Since the moment video games became a commercial success there have been people who have pushed for unfair amounts of censorship to be placed upon the content of the games and its availability to children. These groups push for increased regulations on content but there is already an appointed group to handle this issue, the ESRB. Even though there has been an increase in mature content in the video game industry, increased censorship is not

Four Components Of A Legally Astute Social Media Marketing Manager

1914 words - 8 pages With the advances in technology constantly changing companies have to find better ways to market their products to consumers. The explosion of Facebook has given companies a way to market products to consumers. Examine how a legally astute manager can use social media to his advantage. Review different forms of dispute resolution and determine which one works the best. What is the best course of action, the government can use to

Obama's Values

1217 words - 5 pages As individuals, we don’t tend to take action unless it’s for self-interest; however, in Dreams from My Father, Obama spends three years, after college, as a community organizer in Chicago. Obama goes through tribulations, disappointments, and even complete failures organizing meaningful events, decisive meetings, and humble gatherings but he keeps working toward achieving any possible change in the community. Even though results give him every

Related Papers

The Separation Of Capital Ownership And Control

1577 words - 7 pages The argument of whether the separation of capital ownership and control is an efficient form of organization has constantly been a controversial issue. The criticism whether the controllers’ act is in the best interest of the owners’ wills never end as long as hired managers operate management. As the number of public companies has been increasing over the course of this century, meanwhile the American style of contact based corporation has

The Versatility And Flexibility Of Oled's

1014 words - 5 pages In April 1, 2002, organic light emitting diodes gain rise in the scientific community with their published, more practical form at Ames Laboratory. “Scientists at the U.S. Department of Energy's Ames Laboratory, in collaboration with scientists at the University of Michigan, Ann Arbor, have developed and demonstrated a novel, fluorescence-based chemical sensor that is more compact, versatile and less expensive than existing technology of its

Comparing The Moral Virtues Of Antony And Julian The Apostate

1103 words - 5 pages Roman emperor Julian the Apostate and Christian leader Antony both exhibited many qualities of character during their existence. Both of them led very distinctive lives although shared several ethical values. Book 25 of “The Later Roman Empire” and the book “Early Christian Lives” show concrete evidence of this. In the following essay, I will argue how both leaders’ lives were devoted to their religious beliefs and their mutual cardinal virtues

Living In A Cashless Society Essay

1637 words - 7 pages Money in a traditional sense no longer exists. Money is becoming much of a concept than a physical material, and most ordinary bitter have not see the reality of the switch. People today are using credit and debit cards on a regular basis and in everyday situations such as meal purchased at fast food, highway tolls, clothing, groceries, gas stations, etc. all of these means of systems could be regarded as a cashless society or world. The question