...Induction – Magnet through a Coil Activity P30 Purpose: Electromotive forces can be induced in a coil by changing the magnitude of the magnetic field within the coil, changing the area of the coil, or changing the angle between the magnetic field and the area of the coil. This lab used the first method of changing the magnitude of the magnetic field by dropping a magnet through a coil in order to induce an electromotive force. The EMF was measured as the magnet fell. The integral of EMF versus time gives the magnetic flux according to Faraday’s Law of induction. Faraday’s law of induction essential states that EMF is equal to the rate of change of magnetic flux. Some aspects of Lenz’s law were also investigated. Lenz’s law states that the direction of the current in a coil moves in the direction that causes a magnetic field that opposes the change in the magnetic field of the magnet. Procedure and Materials: The computer was set up by connecting the Voltage Sensor and the interface. A new activity was opened in Data Studio with a graph of Voltage versus Time. Automatic recording was set to begin recording once 0.05 volts was reached and stop at 0.4 seconds of elapsed time. The alligator clips were connected to the circuit board springs next to the induction coil. Data was recorded for three variations of the experiment. First, a single bar magnet was dropped through the coil starting with the south end approximately 2 cm above the coil. Then two magnets were dropped with...
Words: 913 - Pages: 4
...Exploring Faraday’s Law In 1820 Hans Christian Oersted observed that electric currents create magnetic fields. Consequently many scientists made unsuccessful attempts to create current in the presence of magnetic fields. After over 10 years of investigation Michael Faraday and Joseph Henry, working independently on different sides of the Atlantic, made the discovery that if a conducting coil has a changing magnetic flux passing through it an electromotive force is created that causes a current to flow through the coil. The equation describing this phenomenon quantitatively is known as Faraday’s Law. a b c In this activity you will be asked to use Faraday’s Law to explain why the current induced in a coil and thus the voltage across it changes the way it does when the north or south pole of rod shaped magnet is moved into and then back out of the center of a coil of wire at various speeds. No calculations are required in this activity, just thinking! Figure 1: The north pole of a cylindrical magnet is: (a) moving into the center of a coil of wire; (b) reversing direction; and then (c) moving out of the coil. The coil’s voltage vs. time is recorded with a computer interfaced voltage probe. Theoretical Review: According to Faraday’s Law, at any moment the induced emf (denoted ) across a conducting loop with N turns is equal to –N times the rate of change of the magnetic flux passing through the area enclosed by the loop as described in Eq. 1. (Faraday’s Law) [Eq...
Words: 1667 - Pages: 7
...Induced Currents Introduction: In this lab we will reverse the situation. That is we will create an electric field from a changing magnetic field. We will be able to detect this electric field by measuring the induced EMF. Equipment Required: • Windows PC • LabPro • Logger Pro • Voltage Probe • Spool of wire • Bar Magnet • Plastic pipe Theory: Faraday’s law of Induction for the induced emf can be written as: emf = −N ΔΦB Δt Where N is the number of turns of a wire loop, which is multiplied by the time rate of change of the magnetic flux. In this experiment, you will make a changing magnetic field by dropping a magnet through a coil of wire. The motion of the magnet will provide the changing magnetic field, which will induce an emf and hence a current in a coil of wire. You will detect that emf with the voltage probe. Setup: 1 2 3 Connect the power cord to the LabPro and connect it to a computer using the USB cable. Be sure to press the ends in firmly. Connect the voltage probe to the LabPro CH1 port. About 40 cm from the end of the plastic pipe wrap at approximately 3 m of wire around the tube, keeping the coils to a narrow band no more than 2 cm across. Be sure to count the number of coils. Use a piece of tape to hold them in place. Leave about 5 cm of wire from each end free. 4 Remove approximately 2 cm of insulation from the ends of the wires, and connect them to the clip leads of the voltage probe. 5 Hold the tube vertically so that you can drop...
Words: 566 - Pages: 3
...Section # 001 Experiment #: 4 Date performed: 3-17-08 Date due: 3-31-08 Electricity from Motion (Induced Electromotive Force) Principal investigator: Simeon Cherrix_____________________________________ Skeptic: Clayton Spiceland_______________________________________ Researcher Jay Patel______________________________________________ TA Alec Sim_____________________________________________ Role | I | DC | AD | RC | Q1 | Q2 | PI | PG | | | | | | | | | | | | | | | | | | | | | | | | | | | | I introduction DC data and calculation AD analysis and discussion RC results and conclusion Q1/Q2 quiz/prelab PI principal investigator points PG personal grade Introduction: The purpose of the lab is to study the effects due to magnetic fields in motion and also to determine the qualitative features of electromagnetic induction. Procedure: 1. For the Part 1 of the lab, a solenoid was connected to a galvanometer, as shown in the data and calculations. First, the North pole was inserted into the coil, then in the opposite direction, with the South Pole first. Then, the magnitude and sign of the deflection on the galvanometer was recorded in μAmps. Also, an exact sketch is made of the solenoid, the direction of the velocity, the induced magnetic field, the induced current and the magnetic polarity of the solenoid induced in provided in the data and...
Words: 1942 - Pages: 8
...INVESTIGATORY RESEARCH / PROJECT Dealing with MULTIPLE GENERATOR ______________________________________________________________ In partial fulfilment of the subject requirement In Science & Technology IV, PHYSICS Submitted by: Agra anjeanette clarice a. Santos april E. Submitted to: MS.CHRISTINE DIAZ Physics Teacher / IR / IP Adviser 06 January 2014 Monday CHAPTER I – Preliminaries Abstract The purpose of this project is to determine the types of generator there are two parts of generator its either mechanical or electrical terms. Multiple generators provide power for expensive change over device. in some event that a utility powers supply fails or loss it automatically places . the generators in an emergency power mode. Generator are useful in application such as mini hydro power plants, wind turbines or in reducing high pressure gas streams to lower pressure reducing high pressure gas because they can recover energy with simple controls. The purpose of this investigation is to determine how to operate a generator and to provide the practical tools needed to model an implement new technique for generating energy through isolated or grid connected system and to demonstrate it. T plan to make a sample of a multiple generator out of the 10 materials given to me. At first I prepared a square wooden boards put the old cd then apply glue after that put the strong magnet in 90% and...
Words: 1645 - Pages: 7
...Magnetic Induction Lab Complete the lab below. Background – Electricity is vital to our everyday life in the modern in the industrial world. Most electricity is generated by using magnets. Today we will look at what a magnetic field needs to do to create electricity. Learning Goals – The students will: * Develop an understanding of how electricity can be generated using a magnetic field * Develop an understanding of how varying conditions influence the amount of electricity generated. These conditions include: * The number of coils * The area of the coils * The speed of the magnet * The polarity of the magnet * The strength of the magnetic field Procedure – do the following activity using this web site http://www.colorado.edu/physics/phet/simulations/faraday/faraday.jnlp 1. Getting started. Open the website listed above and on the top of the screen select the tab marked Pickup Coil. 2. Make observations & draw conclusions. Add a field meter to the default screen and drag that field meter so it measures the magnetic field in the middle of the pickup coil. Your screen should look something like what you see to the right, on Screen 1. When the light bulb lights up it indicates the electricity has been generated. Grab the magnet and move it around and observe what happens to the strength of the magnetic field and to the light bulb. Based on your observations what conditions must happen for electricity to be...
Words: 537 - Pages: 3
...Experiment 1 R = 300 + (1/300 + 1/300)-1 = 450 ohms Our sine data was very close to a perfect sine wave. It met the expected amplitudes and resembled the sinusoidal function. a.) V = IR; Voltage = Current x Resistance Yes, because based on the uncertainty it reflects that our measured value was relatively close to the actual values. Yes, ohm's law works on the with ac current and voltage based on the linear approximation of calculated slope in terms of R. The values (1025 and 939) are very close. Because they have a relatively same slope, it shows that ohms law is valid. Experiment 3 The reason why putting brass in the coil did not induce a current is that brass is not magnetic. Therefore it does not create a magnetic field inside the coil and therfore no change in flux is generated. The iron produces a larger induced current and since iron is magnetic, it does generate a magnetic field inside the coil and therefore changes the magnetic flux inside the coil and the coil then generates a current to oppose that flux. According to Faraday's law you need a change in the magnetic flux to induce a magnetic field. Because the wire is not moving, there is no induced magnetic field. Initially the small coil inside the large coil genrates a change in magnetic flux through its inherent current. The large coil then generates a current to oppose that flux, which represents the initial spike in the graph. The decrease in voltage is due the large current opposing the...
Words: 428 - Pages: 2
...Criminal Procedure Policy Order and liberty are two areas within criminal procedure that have tension among one another (book). Order is a stronger approach toward the criminal justice system than liberty. Liberty concerns an individual’s rights to due process, which means everybody deserves the same rights when arrested regardless of the circumstances such as poor person versus a rich person. The two models that were developed by Herbert Packer were the crime control model and the due process model (book). Both models have similarities as well as differences and not one is “good” and the other “bad” according to Packer. The two primary goals within the criminal justice system are the need to enforce law and maintain social order and the need to protect people from injustice (defenseinvestigator). The fourth, fifth, sixth, and fourteenth amendments play a signifigant role when analyzing both the due process model and the crime control model. This paper will further explore both models as well as how the models view the fourth, fifth, and sixth amendments and how the fourteenth amendment gives the same rights on a state level as well as federal. Crime Control Model The crime control model is a stern approach to the criminal justice system. As described by Hubert Packer, “the crime control model is like a conveyer belt, moving cases starting from arrest to conviction in a swift and fast process (Book).” Fact finding is what defines this model. If an officer makes an...
Words: 1348 - Pages: 6
...that breaks the Immigration Law should be punished, even if they are not citizens of the country. According to Perez (2001), “In 1986 Congress passed the Immigration Reform and Control Act that, among other things, granted amnesty to illegal immigrants who could demonstrate continual residence in the United States prior to 1982” (Perez, 2001). Because of this law, millions of illegal immigrants can use this act to become citizens of the United States. | According to Mirram-Webster (2012), “amnesty means that the act of an authority (as a government) by which pardon is granted to a large group of individuals” (Mirram-Webster, 2012). Therefore, amnesty is unfair and unconstitutional because all of the illegal immigrants that come into the United States are pardon after they have violated the laws in this country. Why do we continue to allow these illegal immigrants to go unpunished? If it were some of the U.S. citizens breaking this law they would not be granted amnesty; they would be treated differently, so why illegal immigrants should be pardoned? Robert Byrd (2001), a West Virginia senator, says, “Illegal immigrants who have worked for many years in the United States should not be granted amnesty” (Byrd, 2001). Illegal immigrants who work in the United States should be punished because they do not have green cards or permission from the United States to come to America. Although amnesty is an approved law, many peoples do not agree with this law. On the other hand, some Americans...
Words: 1845 - Pages: 8
...Few good man Time from time you may hear stories of abuse by the military justice "system". There are multiple destroyed and financially devastated families out there suffering heartbreak and loss at the hands of an uncaring, unfeeling and unjust process which makes a mockery of our Bill of Rights. Military justice for the majority is prefabricated according to the wishes of the local Commander, and the "trial" or "court-martial" is tantamount to a pre-ordained verdict of GUILTY. How could any court proceeding be considered fair when the "convening authority," by right of title, is given the power to select the judge, the jury and defense and prosecution attorneys? It may go "unsaid," but the implication is very clear - if the convening authority "sees fit" to bring about a court-martial, then the accused can be assumed to be guilty. What's special, or even topical, about A Few Good Men movie is it speaks to how military honor can be so readily suborned by the authoritarian impulse. And second, how the same honest pride - not to mention competence - is necessary to bring such posturing would-be tyrants to justice. The main issue the movie touches upon is military justice. A good marine abides by the following code: 1. Unit 2. Corps 3. God and 4. Country For this code to be at its effective best, it must be governed by truth and justice. What happens when truth and justice fail to be active participants of this code? Justice has been defined in many ways...
Words: 948 - Pages: 4
...Akhil Kaushal P According to The Transparency International 2006 Corruption Perceptions Index: • Most honest countries – Finland, New Zealand, Iceland, Denmark and Singapore • Most corrupt countries – Haiti, Guinea, Myanmar, Iraq, Bangladesh, Chad, Congo and Sudan • China, Brazil, Ghana, Senegal, Peru, Mexico, Saudi Arabia, India and Egypt all rank in the middle Lack of resources Explosive population growth Need stronger and more effective institutions Lack of democracy Ineffective judiciary Unfair elections Lack of free media From The Bulging Pocket and the Rule of Law: Corruption, Inequality, and Trust Inequality –> Low generalized trust & High in-group trust –> Corruption –> Inequality The dilemma of low trust in strangers and high trust only in your own group Inequality and in-group trust lead to clientelism This pattern is difficult to break Two types of inequality: Economic inequality Unfair legal system Makes it more difficult for the poor to have access to the legal system Shielding people at the top Democratic institutions are not sufficient to curb corruption Media consumption, centralization, federalism, the nature of the electoral system, the level of wages paid to officials also don't matter Structural reforms may not matter much for corruption, however: • Democratic countries are far less corrupt than nondemocracies • Countries with strong democratic...
Words: 334 - Pages: 2
...Stand Your Ground Gerald Makey SOC 205 Strayer University The “Stand-your-ground law validates a person in using any physical force including deadly force, when they are not involved in illegal activity and is in a place where he or she has the right be, they have no obligation to haven and have the right to stand their ground. A quick breakdown of this law is that it give a person legal cover in the event that they find themselves in a certain situation in which their survival, or the preservation of their family necessitates them to stand their ground and use a weapon for defense. This law can be referenced back to the Supreme Court case Beard v. United States, 158 U.S. 550 (1895). It is defined in this case that, “A man assailed on his own grounds, without provocation, by a person armed with a deadly weapon and apparently seeking his life is not obliged to retreat, but may stand his ground and defend himself with such means as are within his control; and so long as there is no intent on his part to kill his antagonist, and no purpose of doing anything beyond what is necessary to save his own life, is not guilty of murder or manslaughter if death results to his antagonist from a blow given him under such circumstances (www.justia.com). In Houston, Texas a “Stand-your-ground” case has brought a lot of attention, but also a lot of controversy. In this case Raul Rodriguez was found guilty of killing his neighbor over a dispute over loud music. Rodriguez who was a retired...
Words: 298 - Pages: 2
...Jacob Frederick 5-29-12 Buller Composition II Marijuana: Medicine or Menace? I have had strong feelings about this issue before it was even brought up as a topic for debate in our class. My opinion on the topic has not changed in the slightest, but I did learn a lot of interesting details concerning it. I have always felt that marijuana should be legalized, or at the very least, people with serious medical conditions should have access to it. And marijuana doesn’t even have to be legalized in my opinion, but it should definitely be decriminalized. I don’t think anyone who wants to smoke a plant that they grow themselves should have to suffer consequences, considering they are responsible in their recreational smoking. I do feel that if it were legalized, that there should be an acceptable age limit to buy and/or consume marijuana, comparable to that of alcohol. There are beneficial as well as harmful effects concerning marijuana, but that goes for a lot of things people do in everyday life. And I feel that a lot of time has been spent shining the spotlight on the harmful effects of marijuana, while little research has been done or even allowed, on the benefits of marijuana. While preparing for the debate, I encountered many sources on each end of the spectrum; including some in the middle. Many of the sources I looked at seemed rather credible, but others were most definitely biased. One example of a blatantly biased comment was, "Most pot smokers drink alcohol heavily...
Words: 949 - Pages: 4
...that shape the decisions people or organisations make(Termpaper warehouse,2012).http://www.termpaperwarehouse.com/essay-on/Ethics-In-International-Marketing/53994. Today, law suits are filed against erring companies found wanting or in bridge of ethical standards which has increased the need of cautiousness in the way most companies project their image . It summarizes the natural rights and universal values of the equality of all men and women to the law of the land. It also covers concern for the natural environment, health and safety. Read more: http://www.businessdictionary.com/definition/ethics.html#ixzz28xWPwQco Ethics in marketing are the basic principles that governs the business practice of those involved in promoting their products to or services to consumers(Business dictionary.com). Sound marketing ethics however are those practices that do not impact negatively on the consumers. http://www.businessdictionary.com/definition/marketing-ethics.html Ethics has always been the bane of moral studies and value and has been in practice since the ancient times. (Napoleon,1804) in his 36 codes of conduct, noted that all citizens in France, irrespective of place of birth or social status is entitled to fair and equal treatment. As a branch of philosophy, ethics deals with established laws that guide human relationship and behaviour with emphasis on good sense of judgement. Scholars like Aristotle identified character as ''ethos'' which he described as the...
Words: 294 - Pages: 2
...AL-HELAL Course Title: Administrative Law Class Roll: ZH-26, 4th Batch, 5th Semester Dept. of Public Administration, University of Dhaka. Cell : 01924202090, E-mail : helal_pad_du@yahoo.com RULE OF LAW IN BANGLADESH: AN OVERVIEW ABSTRACT: "No free man shall be taken or imprison or disseized or exiled or in any way destroyed nor will we go or send for him, except under a lawful judgment of his peers and by the law of the land". --MAGNA CARTA This paper is a presentation of the concept of rule of law, Dicey's theory of 'Rule of Law', rule of law in true and modern sense and rule of law in Bangladesh. In Bangladesh context I have discussed the provisions for ensuring rule of law in Bangladesh constitution. I also have discussed the provisions of the constitution, which are contrary to the concept of rule of law in Bangladesh. It has been also identified the difficulties of application of rule of law in Bangladesh. INTRODUCTION One of the basic principles of the English constitution is the rule of law. This doctrine is accepted in the constitution of U.S.A. and also in the constitution of Bangladesh. Now a days rule of law is one of the most discussed subjects of developing countries. Developed countries and donor agencies always instruct the developing countries for sustainable development and good governance. Actually sustainable development and good governance mostly depends on the proper application of rule of law. Laws are made for the welfare of the people...
Words: 3323 - Pages: 14