PHYSICAL QUANTITY

Magnetic flux: formulas and units of measurement

Magnetic flux: symbol Φ, unit Wb. Formulas and explanations for Magnetism.

\PhiΦ\text{Вб}weber

KEY CONNECTIONS

Formulas

\Phi=BS\cos\alphaΦ = BS cos α

n\Phi=LInΦ = LI

\mathcal{E}_i=n\frac{\left|\Delta\Phi\right|}{\Delta t}εᵢ = n|ΔΦ| / Δt

W=\frac{n\Phi I}{2}W = nΦI / 2

Note: The flux Φ is the same for all n turns. The energy formula refers to a constant inductance coil.

NOTATION

\Phi: Magnetic flux is a measure of the magnetic field passing through a surface.
B: Magnetic induction is a force characteristic of a magnetic field.
S: Area is the size of a surface or cross section.
\alpha: Angle is a quantity characterizing the mutual rotation of directions.
n: The number of turns is the number of turns of conductor in the coil.
L: Inductance is the ability of a conductor to create a magnetic field when current passes.
I: Current strength is the charge passing through the cross section of a conductor per unit time.
\mathcal{E}_i: The electromotive force of induction is the action of a vortex electric field in a circuit.
\Delta\Phi: Magnetic flux change is the amount of change in magnetic field flux.
\Delta t: Time interval - the duration of the process under consideration.
W: Magnetic field energy is the energy stored in a magnetic field.

THEORY

PRACTICE