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What is the SI unit of magnetic flux?

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Magnetic flux unit = Weber (Wb) Magnetic field unit = Tesla (T)
Updated On: Feb 18, 2026
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Solution and Explanation

The SI unit of magnetic flux is the Weber (Wb).

Magnetic flux represents the total number of magnetic field lines passing through a given surface. It is mathematically expressed as:
Φ = B × A × cosθ

Where B is the magnetic field strength (in tesla), A is the area (in square metres), and θ is the angle between the magnetic field and the normal to the surface.

One Weber (Wb) is defined as the amount of magnetic flux that, when linking a circuit of one turn, produces an electromotive force of one volt if it changes uniformly to zero in one second.

Thus, the SI unit of magnetic flux is the Weber (Wb).
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