Magnetism and Electromagnetism Everything You Need to Know.

Magnetism and Electromagnetism Everything You Need to Know. Your Guide to Magnetism, Electromagnetism, and Electromagnetic Induction. ChaptersWhat is Magnetism?What is an Electromagnet?What is Electromagnetic Induction?What is a Transformer?In the modern world, we use magnets in an overwhelming number of different ways. From the way that a fridge door closes to the way in which your headphones play music, from the generation and transmission of electricity, to the motor in your car. All of these use magnetic force in some way or another.Given the current ubiquitousness of magnets, our particular civilisation would be a bit useless without them. We’d have no way to move electric currents across the country. All of our electric motors would be useless. And we wouldn’t be able to talk across distance â€" as we have become so used to doing.As such, we shouldn’t take these particular things for granted. Rather, we should â€" all of us, that is, not just the scientists â€" try to understand what they are all about: how they work, what the special relationship is between electricity and magnetism, and how they make our world go around.This is our special task in this series of articles: to allow everyone to understand why it is that electrons have a magnetic moment, say â€" or why an electric current might produce a magnetic field. Why it is that magnetic flux can induce an electric charge, or why all of this stuff is so important for our world.Let’s take a look â€" from the basics of the magnetic field to the most important of the magnetic technologies.On Superprof, you can find a physics and maths tutor s1. Electromagnetism is used everywhere. PetarPhysics Teacher 5.00 (11) £40/h1st lesson free!Discover all our tutors MyriamPhysics Teacher 5.00 (13) £20/h1st lesson free!Discover all our tutors Dr parikhPhysics Teacher 5.00 (8) £40/h1st lesson free!Discover all our tutors RubenPhysics Teacher 5.00 (1) £15/h1st lesson free!Discover all our tutors FrankPhysics Teacher 5.00 (8) £90/h1st lesson free!Discover all our tutors JidePhysics Teacher 4.80 (5) £30/h1st lesson free!Discover all our tutors DorothyPhysics Teacher 5.00 (5) £40/h1st lesson free!Discover all our tutors RahulPhysics Teacher £20/h1st lesson free!Discover all our tutorsWhat is Magnetism?Let’s start with magnetism.Magnetism is the force, present in and between all objects, that is produced by the motion of electrons â€" and that results in the attraction and repulsion of different objects. It is a ‘noncontact’ force that affects every single different object in the world, to a greater or less extent, and t hat is the result of the movement of these subatomic particles, electrons, and their electric charge.Electrons, Magnetic Moments, and the Three Types of Magnetism.Every atom in a substance is made up of particles, including the neutrons, electrons, and protons. In magnetism, it is the electrons that are doing the work.These tend to orbit the neutrons, and they each have their own charge â€" either positive or negative. What generally happens is that the electrons ‘pair’ with those of an opposite charge â€" meaning that an electron with a negative charge would pair with one that is positive â€" and so the material would be relatively stable, as each of the charges would cancel the other out.When substances have paired electrons, we refer to it as diamagnetism.However, there are plenty of types of materials â€" including oxygen â€" that have unpaired electrons. When this happens, the substance becomes much more magnetic, as the electrons can all align. In most of these materials, however, they do not, as the ‘magnetic moments’ of each of these individual electrons are not equal â€" unless they are under the influence of an external magnetic field.These substances which only demonstrate magnetism when they are in an external magnetic field we call paramagnetic.And, finally, there are the ferromagnetic substances. These are the magnetic materials which have unpaired electrons of the same magnetic moment. This means that, spontaneously, they can become magnetic â€" and they will remain magnetic even after the removal of an external magnetic field.What, then, is the Magnetic Field?Every magnet or magnetic object has a magnetic field â€" the neighbourhood around the magnet in which its magnetic force is present. It is the space affected by the magnet’s magnetic charge.Permanent magnets and electromagnets have enduring magnetic fields, which you will conventionally see with iron filings that arrange themselves into the shape of the magnetic field lines. Thes e will follow the flow from the magnet’s north pole to its south pole.Magnetic fields change depending on the strength of the magnet.Find out more about magnetic fields! What is an Electromagnet?Apart from the magnetic moments of the electrons, the other thing that produces magnetic fields are electric charges. This discovery, back in the 1830s, has been one of the most important in history, as it created the link between magnetism and electricity.We’ve just seen that electrons in a substance have a magnetic charge â€" due to the fact of their movement within the magnetic material.But the place in which electrons really move is in electric currents, which, really, are just the movement of electrons. As currents move down a wire, the wire becomes magnetized as the movement of the electrons produces the magnetic field.It was André-Marie Ampère who discovered this, as he showed that parallel wires would attract or repel each other, depending on which way the current would pass. (He would later give his name to the amp or ampere, by the way.)How to Make an Electromagnet.Since the very earliest electromagnets, the technology has not changed very much. They have become stronger, yes, but the overall structure of the devices has remained the same.Electromagnets are made of a coil of wire, wrapped around a core of metal (usually a ferromagnetic material like iron). Into the coil of wire is passed an electric current, whose magnetic field is centred into the hole in the coil â€" i.e. the iron core. This whole structure is known as a solenoid â€" and is still used in all of the places where electromagnetism is in action.As soon as the electric current is switched off, the solenoid ceases to be magnetic.A Note on the Relationship between Magnetism and Electricity.Whilst we know that electricity produces a magnetic field, and that magnetic fields rely on electrons, the distinction between a thing called magnetism and a separate thing called electricity is a false one.These are not discrete forces. Rather, they are the same physical principle â€" like two sides of the same coin. ‘Electromagnetism’ as a thing is actually one of the f undamental forces in the universe.You find out more about electromagnetism in our dedicated article.What is Electromagnetic Induction?One of the most useful discoveries in the history of electromagnetism was made by Michael Faraday, a British scientist in the nineteenth century. This became known as electromagnetic induction â€" and it remains one of the core parts of our knowledge of electromagnetism to this day.Faraday’s experiments focused on the way that electric charges can be manipulated by magnetic fields. And he surmised that changes to a magnetic field can be used to induce an electrical current.This sounds complicated, but his actual practical experiments were fairly simple. He took an iron ring and wrapped two different wires around opposite sides of the ring â€" producing two solenoids on the same piece of iron.Attaching one piece of wire to a battery, he attached another to a galvanometer, a machine which measures electric charges. Connecting and disconnecting the fir st wire from the battery produced a change in the charge detected by the galvanometer. This, for Faraday, proved that the change in the magnetic field in the iron ring could induce an electrical current on the separate wire.To prove his ideas about this particular relationship between electricity and magnetism, he did another experiment. Taking a solenoid without a core (so just a wire coil), he inserted a bar magnet in and out of the coil. Pushing the magnet faster, he found a larger current was produced in the wire.Why was this so important? Because Faraday paved the way for the knowledge that electrical currents don’t only flow through wire â€" whilst he set the theoretical ground on which we came to produce electrical energy by manipulating its magnetic field.Learn more about electromagnetic induction! A diagram of a magnetic fieldWhat is a Transformer?Transformers are the crucial piece of technology that use the science of electromagnetic induction.They are perhaps the most common electrical devices on the planet, with almost the entirety of electrical energy that we produce and use passing through at least one transformer in its journey.So, what are transformers? A transformer is a static device that changes a current of a high voltage into one of a much lower voltage. It does this through the presence of two adjacent solenoids and through Faraday’s electromagnetic induction.Across the country, electricity is transmitted through massive electrical networks. But to keep costs down, the electricity that is transported is of super high voltages. This â€" rather than a high current â€" reduces wasted energy and means that the wires themselves don’t need to be big.However, we can’t actually use high voltage electricity. So, before the electricity is distributed locally into our homes, it needs to be transformed into lower voltage electricity. That’s what transformers are for.Reducing Current Voltage.Faraday’s law shows how electromagnetic induction can be used to reduced and increase the voltage of electrical currents.Think back to his experiment: he used two different coils, in which the changes in magnetic field between the two induced an electrical current in the second.If, however, you vary the number of coils in the wire, you can change the voltage of the current induced. Say you have ten coils on the first wire, you can simply halve the number of coils on the second and you have half the voltage.This is precisely how transformers work.

Maths Teacher Salary UK

Maths Teacher Salary UK How Much Do Maths Teachers Earn in the UK? ChaptersDisparity in Teachers Pay ScaleTeacher Salary based on Seniority and TenureHow Seniority in Primary and Secondary Education affects Teachers PayExperience is (not Necessarily) what Matters Most with Teachers Pay ScaleThe Significance of STEMWhat about Maths Teacher Salary?If you've ever had occasion to talk with a maths teacher, during a parent-teacher conference or during a spontaneous consultation on your child's progress, you might have sensed a feeling of malcontent underlying his/her assertions.Frustration over heavy workload has pushed more educators to become a maths tutor  recently. Teaching geared to ensure students pass mandatory exams instead of delving deeper into curriculum, aspects that would guarantee true learning, is another great source of ire.Impossibly high standards to reach which, by the way, determine a master's earning potential.Is teacher pay really scaled on a pupil reaching learning milestones?How is pay determined for maths teachers in the UK?These permanent posts were few and far between; highly coveted and stingily awarded.Soon, such appointments will be a thing of the past. As the last of the Positioned Professors retire or withdraw from academic life, their posts will be filled by teachers on contract with no possibility of gaining tenure at their institution.The Education Reform Act of 1988 changed the nature of post-secondary schools from mere institutes of higher learning into businesses. That in turn altered the relationship of Professors with their domains.No longer would schools vie for especially talented teachers; nor would genius be particularly cultivated.Everyone signs a contract: permanent, indefinite or school year to school year.This move was meant to narrow the gap between academic institutions and polytechnic schools. Public school teachers at Polytechnic universities have always worked under contract, and such houses of learning have always been 'for profit'.1992 saw a further narrowing of the gap between the two types of schools: all polytechnic colleges became Universities.From then on, any illusion that academic professorship conveyed gravitas was irrevocably destroyed. healthcare to education has adopted it, to one extent or the other.Pay for Performance, ExplainedLet's imagine a particular school district that, for whatever reason, consistently under-performs: the rate of school leavers is fantastically high, test scores are abysmally low and teacher turnover rates are appalling.In spite of regular teacher evaluation and a salary schedule commensurate with other schools in the area, the school administrator has little recourse in improving the educational statistics his facility seems to constantly churn out.Naturally, there is the matter of accountability: are all of the good teachers leaving because the teachers who could benefit from more guidance and development simply aren't getting it?Are the students' education statistics due to the education system failing in their recr uitment of qualified, experienced teachers?Oh, well! Time to sort out the bonuses, now! Let's see... Sir John has been here the longest so he will get the largest cheque, followed by Mrs. ...Therein lies most of that school district's problems.Disbursing loyalty bonuses rather than merit bonuses tends to make employees loyal to the bonus rather than to their employment.Just after the turn of the century, corporations and administrative bodies alike, including our country's Department of Education adopted a supplemental compensation scheme that places the onus on teachers' self-improvement that would lead to better classroom performance rather than to automatic and incremental increases in teachers salary.Here we note that, although teachers do not receive a cost of living allowance, the average teacher salary does increase to reflect the cost of living, year to year.This system of merit pay compels teachers to focus more directly on student achievement and incentivises them to take on extracurricular duties, such as working with SEN students, as mentioned above.However, it makes no allowance for STEM education - instructional programs in science, technology, engineering and maths that is currently THE hot topic in education today.A topic that, till now, haws received no more school funding than any other academic subject.Too few students in our schools see the melding of maths, engineering and technology Source: Pixabay Credit: GeraltThe Significance of STEMEvery aspect of our daily lives is impacted and influenced by STEM. We won't belabour the obvious by citing online shopping statistics or the prevalence of social media - two aspects of modern society wholly dependent on technology. Instead, we point to the road you take to work, the conveyance you arrive in, be it your own car or the tube...Did you listen to music or perhaps an audiobook on the way?Without the study of science and engineering, none of those conveniences would exist for us to enjoy, and wit hout maths, technology and engineering would, dare we say, not exist?Just last weekend, at a forum held in Dubai, the Global Education and Skills forum discussed, among other topics, the need for more and better teachers, who could make the subject material come alive for their students.What's the point of studying maths and science? - a common student complaint.The point is that the the science, engineering and manufacturing sectors estimate a shortfall of 80,000 qualified workers in the next two years - a terrifying statistic!What are we, in Great Britain, doing to head off those potentially disastrous circumstances?  Outreach projects to attract more female students to STEM have not been wholly successful. Still, organisations such as STEM Learning work hard to promote interest and awareness of STEM in schools across the country.They work directly with students but their main function is to support STEM teachers, through continuing education, by helping develop teaching strategie s and by disseminating new information as soon as it becomes available.So, with the spotlight currently on STEM subjects and those teachers doing everything they can to impart their subject matter in the most engaging ways possible...    What about Maths Teacher Salary?Till now, the UK school system makes no distinction between a teacher of Maths and of any other subject, when it comes to pay.Teachers of all subjects are compensated according to their experience and performance, and all fall within the salary range for their level.According to Elizabeth Truss, such unremarkable treatment of maths teachers and cavalier attitude toward maths in general, will certainly lead to Britain falling behind other countries national education systems. In China and South Korea for example, where pupils excel at not only maths but science, biology, literacy and more.She faced great criticism for her position on boosting pay and incentives to attract quality maths instructors and recommending that qualifications for maths teachers be more stringent.Until now, nothing has been done to especially recognize or compensate maths teachers beyond what teachers of other subjects earn.We sure hope that will change.  Discover Maths background and the link to tutoring over the centuries with our guide.Seeking  tutoring jobs  and teaching jobs? Find out to become a maths tutor on Superprof. Whether you want to teach at home or start online tutoring jobs, we can help.