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Electromagnetic Induction Objective: TSW understand and apply the concept of magnetic flux in order to explain how induced emfs are created and calculate. Electromagnetic Induction Objective: TSW understand and apply the concept of magnetic flux in order to explain how induced emfs are created and calculate their value and polarity. You will be responsible for the content contained in chapter 20, sections 1&2 of the textbook.
Electromagnetic induction is the process by which an emf (voltage) is produced in a wire by a changing magnetic flux.
Important Terms alternating current - electric current that rapidly reverses its direction electric generator - a device that uses electromagnetic induction to convert mechanical energy into electrical energy electromagnetic induction - inducing a voltage in a conductor by changing the magnetic field around the conductor induced current - the current produced by electromagnetic induction induced emf - the voltage produced by electromagnetic induction Faradays law of induction - law which states that a voltage can be induced in a conductor by changing the magnetic field around the conductor Lenzs law - the induced emf or current in a wire produces a magnetic flux which opposes the change in flux that produced it by electromagnetic induction magnetic flux - the product of the magnetic field and the area through which the magnetic field lines pass.
Magnetic Flux Consider a rectangular loop of wire of height L and width x which sits in a region of magnetic field of strength B. Faradays law states that an induced emf is produced by changing the flux, but how could the flux be changed?
Here is Faradays Law in equation form: Where Є = The induced emf (voltage) (V) ?? = The change in flux (Wb) ?t = The change in time (s) N = number of loops. Example 2: A circuit with a total resistance of 5? is made using a set of metal wires and a copper bar.
Magnetic Forces and Fields Objective: TSW understand and apply the concepts of a magnetic fields and forces by predicting the path of a charged particle. Figure 31.1 (a) When a magnet is moved toward a loop of wire connected to a sensitive ammeter, the ammeter deflects as shown, indicating that a current. When a coil of wire and a bar magnet are moved in relation to each other, an electric current is produced.
Physics 4 Magnetic Induction Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB.
Magnetic Induction April 1, 2005 Happenings Short Quiz Today New Topic: Magnetic Induction (Chapter 30) Quiz NEXT Friday Exam #3 – April 15 th. Physics 2112 Unit 17 Today’s Concept: Faraday’s Law Lenz’s Law Electricity & Magnetism Lecture 17, Slide 1. Tags: cbse physics class xii question paper 2014 (set-1), physics class 12th 2014 question paper, physics question papers, physics syllabus, physics question paper 2014,cbse class 12 physics question papers with answers , physics question paper 2014,12th question paper 2014, cbse class xii, cbse 12, cbse 12th standard ,CBSE class 12 question paper 2014,class 12 question paper 2014,cbse question paper for class 12 2014,cbse question papers for class 12 2014,sample question paper for class 12,cbse sample question paper ,Cbse class 12 sample question papers , cbse XII physics question paper ,xii cbse question papers , cbse 12th board physics (Theory) question paper 2014 (set-1). AuthorsThis is where you can see with your own eyes what our masters of brushes and pen displays can do! Today is the birthday (1845) of Wilhelm Conrad Rontgen, a German physicist who produced and detected electromagnetic radiation in a wavelength range today known as X-rays or Rontgen rays, an achievement that earned him the first Nobel Prize in Physics in 1901.
Rontgen was born at Lennep in the Lower Rhine Province of Germany, as the only child of a merchant in, and manufacturer of, cloth.
After having declined invitations to similar positions in the Universities of Jena (1886) and Utrecht (1888), he accepted a post from the University of Wurzburg (1888), where he succeeded Friedrich Kohlrausch and found among his colleagues Hermann von Helmholtz and Ludvig Lorenz. Rontgen’s first work was published in 1870, dealing with the specific heats of gases, followed a few years later by a paper on the thermal conductivity of crystals.
Rontgen’s name, however, is chiefly associated with his discovery of the rays that he called X-rays.
On the evening of November 8, 1895, Rontgen found that, if the discharge tube is enclosed in a sealed, thick black carton to exclude all light, and if he worked in a dark room, a paper plate covered on one side with barium platinocyanide placed in the path of the rays became fluorescent even when it was as far as two meters from the discharge tube. In further experiments, Rontgen showed that the new rays are produced by the impact of cathode rays on a material object. At one point while he was investigating the ability of various materials to stop the rays, Rontgen brought a small piece of lead into position while a discharge was occurring. Rontgen did not take patents out on his discoveries, and donated the money for his Nobel prize to the University of Wurzburg. Sauerbraten is a favorite dish throughout Germany and is served in many German restaurants worldwide.  It is a roast (usually of beef or venison) that has been marinated for 3 to 4 days in vinegar, wine, vegetables, and various spices. Sauerbraten is traditionally served with potato dumplings (Klo?e or Knodel), red cabbage, and apple sauce.
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In honor of his accomplishments, in 2004 the International Union of Pure and Applied Chemistry (IUPAC) named element 111, roentgenium, a radioactive element with multiple unstable isotopes, after him. His mother was Charlotte Constanze Frowein of Amsterdam, a member of an old Lennep family which had settled in Amsterdam.
Not having attained the credentials required for a regular student, and hearing that he could enter the Polytechnic at Zurich by passing its entrance examination, he took the exam and began studies there as a student of mechanical engineering. In 1899 he declined an offer to the Chair of Physics in the University of Leipzig, but in 1900 he accepted it in the University of Munich, by special request of the Bavarian government. In 1895 he was studying the phenomena accompanying the passage of an electric current through a gas at extremely low pressure. During subsequent experiments he found that objects of different thicknesses placed in the path of the rays showed variable transparency to them when recorded on a photographic plate. Rontgen thus saw the first radiographic image, his own flickering ghostly skeleton on the barium platinocyanide screen. On 5 January 1896, an Austrian newspaper reported Rontgen’s discovery of a new type of radiation.
In several cities, streets were named after him.  He received numerous prizes, medals, honorary doctorates, honorary and corresponding memberships of learned societies in Germany as well as abroad and, of course, the Nobel Prize in physics of 1901 – the first time it was offered.
With the inflation following World War I, Rontgen fell into bankruptcy later in life, spending his final years at his country home at Weilheim, near Munich. If you don’t care for potato dumplings, Sauerbraten also goes very well with Spatzle, potato pancakes (Kartoffelpuffer or Reibekuchen), and boiled potatoes. Pour the cooled red wine vinegar mixture over the beef,and zip up all but a small hole in the top.  Squeeze out all the air so that the meat is completely surrounded by marinade and then close the top completely. Heat the marinade to a boil.  Add about 1 cup of the hot marinade to the meat along with the Lebkuchen. From 1905 to 1907, the brothers developed their flying machine into the first practical fixed-wing aircraft.
Romeo and Juliet was one of Shakespeare’s earliest plays (written some time between 1591 and 1595). Move the loop of wire out of the field Rotate the loop to change the angle between the field and the area of the loop.


In simple terms the wire resists the change in flux and wants to go back to the way things were.
The induced emf will produce a current in the wire, which will in turn result in a force that opposes the motion of the wire.
When he was three years old, his family moved to Apeldoorn in The Netherlands, where he went to the Institute of Martinus Herman van Doorn, a boarding school.
He attended the lectures given by Rudolf Clausius and also worked in the laboratory of August Kundt.
Here he remained for the rest of his life, although he was offered, but declined, the Presidency of the Physikalisch-Technische Reichsanstalt at Berlin and the Chair of Physics of the Berlin Academy. Previous work in this field had already been carried out by numerous physicists, working on the properties of cathode rays – the name given to the electric current established in highly rarefied gases by the very high tension electricity generated by Heinrich Ruhmkorff’s induction coil.
When he immobilized his wife’s hand in the path of the rays over a photographic plate, he observed, after developing the plate, an image of her hand which showed the shadows thrown by the bones of her hand and that of a ring she was wearing, surrounded by the penumbra of the flesh, which was more permeable to the rays and therefore threw a fainter shadow.
Later, Max von Laue and his pupils showed that they are of the same electromagnetic nature as light, but differ from it only in the higher frequency of their vibration. He later reported that it was at this point that he determined to continue his experiments in secrecy, because he feared for his professional reputation if his observations were in error. Rontgen was awarded an honorary Doctor of Medicine degree from the University of Wurzburg after his discovery.
In keeping with his will, all his personal and scientific correspondence were destroyed upon his death. There are several regional variations of the Sauerbraten, differing mainly by ingredients of the marinade. Refrigerate for 3 days.  If you are neurotic you can flip the bag once per day but it is not necessary. 1570) reports that William Tell, who originally came from Burglen, was known as a strong man, mountain climber, and an expert shot with the crossbow. His visit to the Galapagos Islands is justly famous because of the observations he made there that helped him develop the general principles of natural selection. The first Europeans to visit the islands were the members of a Spanish expedition led by Portuguese navigator Fernandes de Queiros, who arrived in 1605. He did not show any special aptitude, but showed a love of nature and was fond of roaming in the open country and forests.
Rontgen’s work on cathode rays led him, however, to the discovery of a new and different kind of ray. Rheinischer Sauerbraten, a specialty of Rhineland-Palatinate (Rheinland Pfalz) and North Rhine-Westphalia (Nordrhein-Westfalen) where Rontgen was born, is the most well known version. He was especially apt at making mechanical contrivances, a characteristic which remained with him also in later life.
Today, Rontgen is considered the father of diagnostic radiology, the medical specialty which uses imaging to diagnose disease and other medical ailments.
He spent many vacations at his summer home at Weilheim, at the foot of the Bavarian Alps, where he entertained his friends and went on many expeditions in the mountains.
Unique to the Rheinischer Sauerbraten is that it is served with a a slightly sweet sauce made with raisins. In some variations, such as the Rheinischer Sauerbraten, the sauce has a slightly sweet flavor. In 1862 he entered a technical school at Utrecht, where he was however unfairly expelled, accused of having produced a caricature of one of the teachers, which was in fact done by someone else. It is not believed his carcinoma was a result of his work with ionizing radiation because of the brief time he spent on those investigations, and because he was one of the few pioneers in the field who used protective lead shields routinely.
In 1874 he qualified as Lecturer at Strasbourg University and in 1875 he was appointed Professor in the Academy of Agriculture at Hohenheim in Wurttemberg. Amiable and courteous by nature, he was always sympathetic to the views and difficulties of others.
In 1876 he returned to Strasbourg as Professor of Physics, but three years later he accepted the invitation to the Chair of Physics in the University of Giessen.
Much of the apparatus he used he built himself with considerable ingenuity and experimental skill.



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