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Which of the following is the SI unit of magnetic flux?
Tesla
Weber
Henry
Gauss
Weber
The SI unit of magnetic flux is the Weber (Wb), named after the German physicist Wilhelm Eduard Weber. It measures the total magnetic field passing through a given surface area.
The SI unit of magnetic flux is the Weber (Wb), named after the German physicist Wilhelm Eduard Weber. It measures the total magnetic field passing through a given surface area.
Think of magnetic flux like the total volume of rain falling through a specific open window frame; a stronger rain intensity or a larger window results in more rain passing through.
Remember: Magnetic Flux gets caught in a 'Web', so its unit is Weber (Wb).
ΦB=B⋅A⋅cos(θ) — Magnetic flux for a uniform field
1 Wb=1 T⋅m2=1 V⋅s — Equivalence of Weber in terms of Tesla and other units
Magnetic flux represents the total number of magnetic field lines passing through a given cross-sectional area. Mathematically, it is defined as the dot product of the magnetic field vector and the differential area vector over a surface.
One Weber is defined as the magnetic flux that, when changing through a single-turn circuit of wire at a uniform rate over one second, induces an electromotive force of one volt.
It bridges the gap between spatial geometry (area) and field intensity.
Applying Faraday's Law of Electromagnetic Induction in electric generators and transformers
Designing electromagnetic shielding and components
| Feature | Weber (Wb) | Tesla (T) |
|---|---|---|
Physical Quantity | Magnetic Flux | Magnetic Field / Flux Density |
Option A (Tesla) is the SI unit of magnetic field strength or magnetic flux density.
Option C (Henry) is the SI unit of electrical inductance.
Option D (Gauss) is the CGS unit of magnetic field, where 1 T=104 G.
B is correct — Weber is the SI unit of magnetic flux.
Keep units straight during competitive exam calculations by remembering that magnetic flux is in Webers, whereas magnetic field intensity or density is in Teslas.