Physics facts for students and physicists presented in short and concise manner.
There are two quantities that describe any given magnetic field: Magnetic induction, B and Magnetic intensity, H In the cgs (centimeter, gram, second) system of units B equals H, but in the international SI system they are identical up to a constant. In the international SI system magnetic induction is measured in Tesla (T)...
The spontaneous magnetization is the total magnetization that exists inside a microscopic volume of material when there is no magnetic field present. It depends on the temperature among other factors. The spontaneous magnetization of iron, Fe, at room temperature (RT) is 1 720 000 A/m. The spontaneous magnetization of cobalt, Co, at RT is...
Earth’s magnetic field is 50 A/m, which is a very low value as compared to the common macroscopic magnets. This is an equivalent of about 50 µT (micro Tesla) or 0.5 Gauss. Earth’s magnetic moment, however, is large – 8∙1022 Am2. The Earth’s magnetic field value can be compared to the values other celestial objects....
Magnetization, M, is magnetic dipole moment per unit volume of material. It is measured in amperes per meter A/m. A lot of magnetic materials have spontaneous magnetization. Check the values of spontaneous magnetization of iron, cobalt and nickel.