What is the definition of magnetic flux?

Magnetic flux is defined as the number of magnetic field lines passing through a given closed surface. It provides the measurement of the total magnetic field that passes through a given surface area. Here, the area under consideration can be of any size and under any orientation with respect to the direction of the magnetic field.

Symbol of magnetic flux

  • Magnetic flux is commonly denoted using the Greek letter Phi or Phi suffix B.
  • Magnetic flux symbol: Φ or ΦB.

Calculation of magnetic flux

The magnetic flux formula is given by,

\(\Phi _{B}= B.A\) \(\Phi _{B}= B.A \cos \Theta\)

Where,

B = Magnetic field,

A =  Surface area and

Θ =  Angle between the magnetic field and normal to the surface.

 

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