[Physics Class Notes] on Magnetic Circuit Pdf for Exam

One or more closed-loop pathways carrying a magnetic flux create a magnetic circuit.

Permanent magnets or electromagnets produce the flux, which is limited to the route by magnetic cores made of ferromagnetic materials like iron, though there may be air holes or other materials in the path. Magnetic circuits are used in a variety of applications to effectively channel magnetic fields like electric motors, generators, galvanometers, transformers, relays, lifting electromagnets, SQUIDs, and magnetic recording heads.

The equations of the magnetic field of an unsaturated ferromagnetic substance and the equations of an electrical circuit have a one-to-one correspondence of a “magnetic circuit.”

The magnetic fields of involved devices like transformers can be easily overcome using the methods for electrical circuits using this principle.

Some Examples of Magnetic Circuits are:

1. horseshoe magnet with iron keeper (low-reluctance circuit).

2. horseshoe magnet with no keeper (high-reluctance circuit).

3. electric motor (variable-reluctance circuit).

4. some types of pickup cartridge (variable-reluctance circuits).

Magnetic Flux

The number of magnetic field lines that travel through the cross-sectional region of a magnetic component determines the magnetic flux through that component.

This is the net sum, which equals the number of people who pass through in one direction minus the number of people who pass through in the opposite direction. The product of the magnetic field and the area element determines the flux by an element of area perpendicular to the magnetic field direction. A scalar product of the magnetic field and the area element vector defines magnetic flux in general.

It has a magnetic nucleus, for starters. The heart can be made of a single material, such as sheet steel, or it can be made up of several parts with an air space between them. At least one pair of wire spins, i.e. a coil built around the core, surrounds the core. Transformers have several sets of turns (in the simplest case, one for the primary and another for the secondary).