<P> An alternative mnemonic to the right hand rule is Flemings's left hand rule . </P> <P> The formulas derived for the magnetic field above are correct when dealing with the entire current . A magnetic material placed inside a magnetic field, though, generates its own bound current, which can be a challenge to calculate . (This bound current is due to the sum of atomic sized current loops and the spin of the subatomic particles such as electrons that make up the material .) The H - field as defined above helps factor out this bound current; but to see how, it helps to introduce the concept of magnetization first . </P> <P> The magnetization vector field M represents how strongly a region of material is magnetized . It is defined as the net magnetic dipole moment per unit volume of that region . The magnetization of a uniform magnet is therefore a material constant, equal to the magnetic moment m of the magnet divided by its volume . Since the SI unit of magnetic moment is A ⋅ m, the SI unit of magnetization M is ampere per meter, identical to that of the H - field . </P> <P> The magnetization M field of a region points in the direction of the average magnetic dipole moment in that region . Magnetization field lines, therefore, begin near the magnetic south pole and ends near the magnetic north pole . (Magnetization does not exist outside the magnet .) </P>

What is the si unit of magnetic field
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