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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