Magnetic Flux & Magnetic Flux Density?

Question

whats the difference?

Answer 1

Magnetic Flux: A measure of the quantity of magnetism, being the total number of magnetic lines of force passing through a specified area in a magnetic field.

Magnetic flux density, otherwise known as magnetic field density, is essentially what the layman knows as a magnetic field — akin to a gravitational or electric field.

Answer 2

Magnetic flux is a gross measure of a fairly theoretical value. It is measured in "Lines of Flux" which you can more or less see when you apply iron filings to a sheet of non-magnetic material as it sits over a magnet. There are magnetic films that can expose this as well. The reason I say it is fairly theoretical is that there is no real for sure definition here. It is more or less a good way to understand the condition. It isn't a hard fact for you to "Know."

Magnetic Flux Density develops as a relative measure of the flux passing through something. This flux may be limited by how permeable the material is. It may be limited by the strength of the source of the flux and it is limited by the inverse square law. It decreases by 1/square of the distance.

The reason for measuring Flux Density is that it provides an approximate ability for us to measure the induction of electrical currents as we move a magnetic field around. The problem here is that this is only an approximation and generally fails in the first or second decimal place. This means the accuracy is usually something like +/- 20%. Even our best estimates using such math tools are only accurate to about +/- 2%.

Another reason for such estimates is to determine the force the field applies to an object. A simplified understanding of the Maxwell equations derives the equation of F = B(squared) or Force equals the magnetic flux density squared. Of course this is altered by distance and by the material being affected.

Remember there are no things except superconductors that actually stop the passage of a magnetic field. All other things conduct magnetic fields. Some things are repelled by them and some things are attracted by them.

As magnetic flux gets really strong some effects stand out strongly but they are always there even at a weaker level. In the very strong magnetic field of a MRI machine, Aluminum blocks will appear to be frozen in space. They will not fall. Well they do fall but very slowly and trying to move them makes them appear to be mounted in space. In the same field an Iron block will smash into the wall of the MRI machine. The machine is used because is atoms in a magnetic field align with the field and when the field is reversed they give off radio waves that match their Atomic weight. This allows us to build a picture of the person without taking them apart. We just spin their atomic parts one way and then another.

All sorts of chemical and molecular reactions happen as matter lines up in magnetic fields. Only recently has modern science really begun to have even a basic understanding of this.

The stronger a magnet is the more flux it presents. Please understand that there is no difference between a permanent magnet's field and that of a electrical coil or electro-magnet. They are identical.

Answer 3

magnetic flux - strength of field
magnetic flux density - strength of field /area

Answer 4

The flux is a noun. The density is a descriptive pronoun.

Answer 5

Arthur N's answer contains a flaw in the last para.
There is a major difference between the two types.
One has a static field while the other can be made variable.

Answer 6

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