AskEssays.com - Discover essay samples

Lenz's Law And Faraday's Law Of Induction

4.9 of 5.0 (69 reviews)

Contains
342 words
Category
Science & Nature

Lenz's Law And Faraday's Law Of Induction Page 1
Lenz's Law And Faraday's Law Of Induction Page 2
The above thumbnails are of reduced quality. To view the work in full quality, click download.

1. With this definition of the flux being , we can now return to Faraday's
investigations. He found that the magnitude of the emf produced depends on the
rate at which the magnetic flux changes. Faraday found that if the flux through
N loops of wire changes by an amount , during a time delta t, the average
induced emf during this time is

This fundamental result is known as Faraday's law of induction.
The minus sign is placed there to remind us in which direction the
induced emf acts. Experiment shows that an induced emf always gives rise to a
current whose magnetic field opposes the original change in flux. This is known
a Lenz's law. Let us apply it to the case of relative motion between a magnet
and a coil. The changing flux induces an emf, which produces a current in the
coil; and this induced current produces its own magnet field. If the distance
between the coil and the magnet decreases; so the magnetic field, and therefore
the flux, through the coil increases. The magnetic field of the magnet points
upward. To oppose this upward increase, the field produced by the induced
current must point downward. Thus Lenz's law tells us that the current must move
by the use of the use of the right hand rule. If the flux decreases, so the
induced current produces an upward magnetic field that is "trying" to maintain
the status quo.
Let us consider what would happen if Lenz's law were just the reverse.
The induced current would produce a flux in the same direction as the original
change; this greater change in flux would produce an even larger current,
followed by a still larger change in flux, and so on. The current would continue
to grow indefinitely, producing power (=) even after the original stimulus ended.
This would violate the conservation of energy. Such "perpetual - motion" devices
...

You are currently seeing 50% of this paper.

You're seeing 342 words of 683.

Similar essays


Millennium Bug

What Effect will the have on Society? People talk about the , but few actually know what it is and how big an effect is could have. Virtually everything is our society is vulnerable, from water and electricity to our phone bills and savings accounts. The is a design fault dating back to the early days of computers and the way they store time and...

3 reviews
Download
Projectile Motion

PROJECTILE MOTION * The motion of the body thrown horizontally or an angle other than 90[0] with the horizontal component * Trajectory is the path that a projectile follows * Parabola is the trajectory of a projectile * Two components of projectile motion: Vertical component- air resistance is neglected; a projectile moves horizontally at const...

66 reviews
Download
Evolution 2

We act like animals, we eat like animals, and we are animals. The many theories of evolution such as Darwin?s theory of evolution prove to us that we choose to believe that we are not animals when we really are. Evolution is the sequencial process of change over periods of time, which shapes and establishes the formation of modern man. In refer...

124 reviews
Download
Anti-Matter

Introduction Ordinary matter has negatively charged electrons circling a positively charged nuclei. has positively charged electrons - positrons - orbiting a nuclei with a negative charge - anti-protons. Only anti-protons and positrons are able to be produced at this time, but scientists in Switzerland have begun a series of experiments which the...

77 reviews
Download
Adolescent Depression: The Under Acknowledged Disease

Depression is a disease that afflicts the human psyche in such a way that the afflicted tends to act and react abnormally toward others and themselves. Therefore it comes to no surprise to discover that adolescent depression is strongly linked to teen suicide. Adolescent suicide is now responsible for more deaths in youths aged 15 to 19 than card...

181 reviews
Download
Depression

In today's society, we are faced with or placed in many unpredictable and stressful situations. However, many of us manage to properly analyze the situations and maintain our sanity, experiencing only a mild form of , if any. Others may encounter similar situations and become mentally depressed. Some reasons for being depressed are normal, such as...

43 reviews
Download
Acetaminophen

In the late 1800's it was discovered that papa-amino-phenol, could reduce fever, but the drug was too toxic to use. A less toxic extract called phenacetin was later found to be just as effective but also had pain-relieving properties. In 1949, it was learned that phenacetin was metabolized into an active but also less toxic drug, . Since then, ha...

2 reviews
Download
Centripetal Force and Acceleration

Homework #3b - II: Show your work under each question 1) You are riding your bike on a track that forms a vertical circular loop. If the diameter of the loop is 10.0 m, what is the minimum speed required for you to make it around the loop? 2) You are swinging a bucket of water in a vertical circle. Assuming that the radius of the rotation of...

186 reviews
Download
Cloning

According to Professor Wilmut of the Monash Mecical Center, "Creating a clone though these new methods calls into question our most sacred fundamental beliefs. It has the potential to threaten the sacred family bonds at the very core of our ideals and our society. At its worst, it could lead to misguided and malevolent attempts to select certa...

71 reviews
Download
Evolution From A Molecular Perspective

Introduction: Why globular evolution? Evolution has been a heavily debated issue since Charles Darwin first documented the theory in 1859. However, until just recently, adaptation at a molecular level has been overlooked except by the scientific world. Now with the help of modern technology, the protein sequences of nearly every known living thi...

32 reviews
Download
The Stroop Phenomenon

Introduction is a way of measuring how automatic or intentional some well practised tasks are and how we respond in conflict situations. This phenomenon also measures individual distinctions, originality and cognitive flexibility. The two aspects of cognitive development that are demonstrated by the stroop task are naming response and counting r...

198 reviews
Download
Dinosaurs

Dinosaur is the name of large extinct reptiles of the Mesozoic Era, during which they were the dominant land animals on Earth. The term was proposed as a formal zoologic name in 1842 by the British anatomist Sir Richard Owen, in reference to large fossil bones unearthed in southern England. The various kinds of dinosaurs are classified in two for...

125 reviews
Download
Copper

Period 3 Grade 8 is a mineral. it is not a plant or a animal. is a metallic metal. It can never be broken down into differnet substances by normal chemical means. was one of the first metals known to humans. People liked it because in it's native condition, it could easily be beaten into weapons or tools. has been one of the most useful metals...

1 reviews
Download
Could Gambling Save Science: Encouraging An Honest Consensus

Visiting Researcher, The Foresight Institute P.O. Box 61058, Palo Alto, CA 94306 USA hanson@charon.arc.nasa.gov 510-651-7483 To appear in Social Epistemology, 1992. (version appeared: in Proc. Eighth Intl. Conf. on Risk and Gambling, London, 7/90.) C O U L D G A M B L I N G S A V E S C I E N C E? Encouraging an...

27 reviews
Download
Atsisiųsti šį darbą