Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

Electromagnetism: UNIL-208

Description

This lecture covers Chapter 12 on Lenz's law and electromagnetic circuits, discussing topics such as induced voltage in a moving bar, magnetic flux in a variable surface circuit, and the application of Lenz's law in various electromagnetic phenomena.

This video is available exclusively on Mediaspace for a restricted audience. Please log in to MediaSpace to access it if you have the necessary permissions.

Watch on Mediaspace

Official source

Ontological neighbourhood

Physics

Electromagnetism: Electrical networks, Electrodynamics

Electrical engineering

Electronic engineering: Power electronics

Power engineering: Electric power transmission

Related concepts (32)

Electromagnetic induction

Electromagnetic or magnetic induction is the production of an electromotive force (emf) across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faraday's law of induction. Lenz's law describes the direction of the induced field. Faraday's law was later generalized to become the Maxwell–Faraday equation, one of the four Maxwell equations in his theory of electromagnetism.

Electromagnetism

In physics, electromagnetism is an interaction that occurs between particles with electric charge via electromagnetic fields. The electromagnetic force is one of the four fundamental forces of nature. It is the dominant force in the interactions of atoms and molecules. Electromagnetism can be thought of as a combination of electrostatics and magnetism, two distinct but closely intertwined phenomena.

Magnetic circuit

A magnetic circuit is made up of one or more closed loop paths containing a magnetic flux. The flux is usually generated by permanent magnets or electromagnets and confined to the path by magnetic cores consisting of ferromagnetic materials like iron, although there may be air gaps or other materials in the path. Magnetic circuits are employed to efficiently channel magnetic fields in many devices such as electric motors, generators, transformers, relays, lifting electromagnets, SQUIDs, galvanometers, and magnetic recording heads.

Electromagnetic pulse

An electromagnetic pulse (EMP), also referred to as a transient electromagnetic disturbance (TED), is a brief burst of electromagnetic energy. The origin of an EMP can be natural or artificial, and can occur as an electromagnetic field, as an electric field, as a magnetic field, or as a conducted electric current. The electromagnetic interference caused by an EMP can disrupt communications and damage electronic equipment. An EMP such as a lightning strike can physically damage objects such as buildings and aircraft.

Electromagnetic coil

An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil (spiral or helix). Electromagnetic coils are used in electrical engineering, in applications where electric currents interact with magnetic fields, in devices such as electric motors, generators, inductors, electromagnets, transformers, and sensor coils. Either an electric current is passed through the wire of the coil to generate a magnetic field, or conversely, an external time-varying magnetic field through the interior of the coil generates an EMF (voltage) in the conductor.

Related lectures (42)

Electromagnetism: Fundamentals and Applications

Explores the basics of electromagnetism, Ohm's law, Lenz's law, and Faraday's law, shedding light on electromagnetic devices.

Emission of EM waves

Explores the emission of electromagnetic waves, focusing on the role of alternating current in producing them using LC circuits.

Sources of Magnetic Fields and Induction

Explores the generation of magnetic fields, induction, and practical applications in electromagnetism.

Faraday's Law of Induction

Explains how time-varying magnetic fields induce electric currents through Faraday's experiments and the third Maxwell's equation.

Magnetism: Basics and Phenomena