What is magnetic flux and magnetic flux density? Please keep it simple.

[martin glen]

Im revising for my A levels and I could really do with a simple, straight forward definition for magnetic flux and magnetic flux density. Can anyone please help? I'd be very grateful.

F=BIl

∅=BA

 

[technician]

Have you seen diagrams of magnetic fields or iron filings representations of magnetic fields?
They are represented by 'lines of force', these lines of force are given a unit in physics... they are called Webers and the lines of force are known as the 'flux'.
In these magnetic field pictures the strong part of the field is near the magnet poles where the lines(flux ,Webers) are close together, so strength is something to do with how close the lines (Webers) are. The more lines per square metre (Webers per squ metre) the stronger the magnet.
Webers per square metre is given a special name 'magnetic flux density' known as magnetic field strength. It is measured in Webers per square metre which is given a special name... Tesla... we love to commemorate physicists in physics by naming units after them.
So... flux (phi) represents 'number of lines' measured in Webers
Flux density B is 'number of lines/m^2...webers/m^2 or Tesla
so flux = B x A ... Webers = Tesla x m^2
Horrible, confusing mixture of units... hope this helps

 

[martin glen]

Yeah that does help a lot, thank you!

 

[asitiaf]

so beautifully replied

 

[Nickie]

cosθ

Magnetic flux refers to the measure of the total number of magnetic field lines passing through a given area. It is represented by the symbol Φ and is measured in units of webers (Wb). Magnetic flux is directly proportional to the strength of the magnetic field and the area it passes through.

Magnetic flux density, also known as magnetic induction or magnetic field strength, is a measure of the strength of the magnetic field at a specific point. It is represented by the symbol B and is measured in units of teslas (T). Magnetic flux density is directly proportional to the magnetic field strength and is affected by the material it passes through.

In simpler terms, magnetic flux is the amount of magnetic field passing through a given area, while magnetic flux density is the strength of that magnetic field at a specific point. Both are important concepts in understanding the behavior of magnets and electromagnetism.