magnetic flux?

Question

magnetic flux doesnt make any sense to me,wat is exactly magnetic flux? some says it is the magnetic field strength times surface area that is proportional to the magnetic field. some says it is a property that takes magnetic field and extent of field into account. when i was doing questions, flux always appears,but i dont understand wat it really is.
chhers

Answer 1

see:
http://en.wikipedia.org/wiki/Magnetic_flux

Answer 2

Those "some who say" are correct! I was into learning about this and did some intense research into this area because I am interested in Tesla coils and the Ultra Violet spectrum:
B (magnetic flux and field)= u_0 (permeability of some metal like Iron, Nickel, Cobalt or Air)x i (ampers - current or speed of electric flow)/2pie x distance (of the material your are using) for fields based on wire
B also = u_0 x i x N (number of turns in a coil made of a particular wire)/ L (the length of the coil)
Get yourself a natural magnet and some nickel shavings, place the magnet under a piece of paper and drop the nickel shavings on top- what your see represents the magnetic flux of the magnet (the larger this organized pattern is the stronger your magnetic field is). I'll go on the web right now to see if I can find a description for you to illustrate. Good old Wikepedia! Whoever put that together sure spent a lot of time! Fields, like described above, are measure in various units, depending on which country you live in (more conversion work!) I'm used to Teslas from my research, but you can also use the following:
B=magnetic field = 1 T (Tesla) = 10^4 guass = 1 Newton/amper-meter = 1 weber/m^2 based on some wonderful charts published by "Permacharts)

Answer 3

Think of magnetic flux as the number of magnetic field lines that penetrate a surface area.

To understand this, I need to discuss two important concepts.
1. Magnetic field lines – You should have seen magnetic field lines drawn in class. As a reminder, here is a link to an applet of a typical magnetic field pattern (a bar magnet)

http://www.walter-fendt.de/ph14e/mfbar.htm

Physically, we can think of magnetic field lines as the path that a moving charge would travel if it were placed in that region of space.

2. Surface Area – Think of surface area as a purely theoretical device. It allows us to calculate physical quantities. It turns out that it is of great physical interest if we arbitrarily select surface areas in space and observe the amount of field lines that pass through it.

Now, here is the important point. The magnetic field lines that pass through a surface area will depend not only on the shape of the selected surface area, but also the orientation of the surface area.

Click on the link below and investigate the applet half way down the page.

http://www.ee.surrey.ac.uk/Teaching/Courses/EFT/dynamics/html/magnetic_flux.htm

It should be clear that as the surface area becomes parallel to the magnetic field the number of lines penetrating, and hence the flux, decreases to zero. Likewise, the flux is at a maximum when the surface area is perpendicular to the field.

The idea of flux is important because you will need it when you look at electromagnetic induction (i.e. Faraday's Law - The amount of induced voltage is proportional to the rate of change in magnetic flux).

The above discussion is fully consistent with your definitions (though I don’t have the time or energy to prove it mathematically).

Answer 4

U understand that magnetic flux will induce current movement when it is cut with a wire. That is how a generator works. A lightning strike causes such a huge magnetic flux that it can cause current to flow in a wire several miles away. Most people think they were struck by lightning but it is the induced voltage.

Answer 5

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