Magnetic Flux

What is Magnetic Flux?

Flux is basically count of number of lines crossing a surface.

The number of magnetic field lines crossing a surface is known as magnetic flux linked with that surface.

Consider a closed curve enclosing an area A (as shown in the figure). Let there be a uniform magnetic field B in that region. The magnetic flux through the area A is given by

Φ = B . A = B A cosθ

In case of a coil of area A having N turns

Φ = NBA cosθ

Magnetic flux is a scalar quantity. It can be positive, negative or zero.

The dimensional formula of magnetic flux is [ML²T^–2A^–1].

The SI unit of magnetic flux is weber. The CGS unit of magnetic flux is maxwell.

1 weber = 10⁸ maxwell

You may also want to check out these concept related to electromagnetic induction:

• Electromagnetic Induction
• Faraday’s Laws
• Lenz’s Law

Direction of Area Vector

• Area vector is ⊥ to the surface.
• For open surface choose one direction as the area vector direction and stick to it for the whole problem.
• For closed surfaces outward normal is taken as area vector direction

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