Residual induction

Residual induction is also called magnetic flux density or field B. It is the physical quantity which indicates the intensity of the magnetic fields, that is to say the induction which remains in a saturated magnetic material once the magnetizing field has been removed. We can also call it magnetic flux 0 which crosses perpendicularly a unit of area A. In addition, it can be symbolized by gauss, with which 10,000 gauss refers to 1 tesla. Magnetic induction decreases with increasing temperature.

Otherwise, all the internal and external points of the magnet have the possibility of affecting a field intensity B with a certain direction which will be oriented with a needle. The density of magnetic flux can be obtained through the calculation carried out by computer programs, since it requires great complexity. We will show you the most common formulas.

Field B can be obtained from the formula:

  • µ0 = the constant which designates the permeability of free space

  • q = the charge that created the field

  • v = the speed of the charge

  • ur = the unit vector

  • r = distance from the load point to the point where it is calculated on the ground.

To calculate the magnetic flux density of a conductor perpendicular to the magnetic field line, the formula is:

  • B= the density of the magnetic flux

  • F = force in Newtons

  • I = current ampere

  • L= conductor length

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