A simple electromagnet is made by coiling wire around an iron nail.Įlectromagnets are used in devices such as electric bells, and door locks that can be controlled remotely. ![]() The iron core increases the solenoid’s magnetic field strength. A solenoid, shown here in cross section, has a stronger electromagnetic field than a single straight wire ElectromagnetsĪ solenoid with an iron core is called an electromagnet. The small magnetic fields caused by the current in each coil add together to make a stronger overall magnetic field. With years of experience Jonas helps students to improve their. The field inside a solenoid is strong and uniform. GCSE Physics Revision with Jonas provides you with easy-to-follow theory and examples. When an electric current flows, the shape of the magnetic field is very similar to the field of a bar magnet. The strength of the magnetic field is greater:Ī solenoid consists of a wire coiled up into a spiral shape. This magnetic field can deflect the needle of a magnetic compass. ![]() When a current flows in a wire, it creates a circular magnetic field around the wire. This way, you’ll gradually work through the areas that you’re weak in.Jonny Nelson introduces an animated explanation of electromagnetism Understand why you’re getting them wrong, and how to find the right answer. Go back and review the concepts behind those problems. This indicates that you’re weak in this particular area. While doing practice problems, you’ll probably encounter some that are difficult for you. Review problems that you had trouble with. Finally, enjoy using the native mobile app, and before you know it, you'd have answered hundreds of questions, drilling the content into your memory. Go through our questions of the day at any time to get started with your exam preparation, browse our collection of articles to find methods, tools, best practices, and examples to maximise your learning. RevisePal offers all the tools you need to be successful in passing your upcoming GCSE exams. Use the RevisePal mobile app to practice your way to success. If you have a physics test coming up, however, you can do well with good study strategies. Physics is a difficult subject, and many students have trouble with it. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in these and other academic disciplines such as mathematics and philosophy. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. Over much of the past two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the Scientific Revolution in the 17th century these natural sciences emerged as unique research endeavours in their own right. Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. A scientist who specialises in the field of physics is called a physicist. ![]() Physics is one of the most fundamental scientific disciplines, with its main goal being to understand how the universe behaves. Physics is the natural science that studies matter, its fundamental constituents, its motion and behaviour through space and time, and the related entities of energy and force.
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