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About this Lecture
In this mini-lecture, we consider two demonstrations: (i) the first utilising natural magnets to display that like poles repel and opposite poles attract; and (ii) the second using an ammeter, a closed circuit, and a permanent magnet to illustrate Faraday’s Law, where we see that when we pass the circuit loop through the permanent magnet, the magnetic field penetrating the centre of the loop changes, which changes the magnetic flux through the loop and thus induces a current in the circuit.
In this course, Professor Mohamed Anber (Durham University) explores magnetism. In the first mini-lecture, we discuss the magnetic fields of natural magnets and infinite wires carrying current. In the second mini-lecture we define the magnetic force and explore examples involving the magnetic force of one infinite wire on another. The third mini-lecture introduces magnetic flux in order to understand Faraday’s Law. In the fourth mini-lecture we turn towards an application of magnetism, the electric generator, and work through a calculation that gives us the electromotive force (EMF) of the electric generator. The fifth mini-lecture introduces a useful tool called the right hand rule that allows us to determine the direction of a magnetic field due to a wire carrying current, before introducing the principle of superposition and using these two new concepts in a variety of examples involving two infinite wires carrying current. The sixth and final mini-lecture goes over two demonstrations, the first involving natural magnets, and the second displaying Faraday’s Law.
Mohamed Anber is a Professor of Mathematical and Theoretical Particle Physics at Durham University. At the time of filming his course on magnetism, he was a Professor of Physics at Lewis & Clark College in Portland, Oregon in the United States. His research interests involve a broad range of theoretical physics topics, including those in quantum field theory and theoretical cosmology.
Cite this Lecture
Anber, M. (2022, January 12). Magnetism - Demonstrations [Video]. MASSOLIT. https://massolit.io/courses/magnetism/demonstrations
Anber, Mohamed. "Magnetism – Demonstrations." MASSOLIT, uploaded by MASSOLIT, 12 Jan 2022, https://massolit.io/courses/magnetism/demonstrations