Calculate uniform-field magnetic flux, field magnitude, flat surface area, or the angle between the field and the surface normal.
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Magnetic Flux Formula
The following equation can be used to calculate a magnetic flux.
- Where F is the magnetic flux (webers)
- B is the magnetic field (teslas)
- A is the area (m^2)
- a is the angle between the magnetic field and the surface normal (perpendicular to the surface). Use the actual angle: 0° gives maximum positive flux; 90° gives zero flux.
To calculate a magnetic flux, multiply the magnetic field strength by the area, then multiply by the cosine of the angle between the field and the surface normal.
Magnetic Flux Definition
A magnetic flux is defined as the total strength of the magnetic field that passes through any given area.
Magnetic Flux Example
How to calculate magnetic flux?
- First, determine the magnetic field.
Measure the strength of the magnetic field.
- Next, determine the total area.
Calculate the total area the magnetic field is moving through.
- Next, determine the angle.
Calculate the angle between the magnetic field and the surface normal.
- Finally, calculate the magnetic flux.
Calculate the magnetic flux using the formula above.
FAQ
Magnetic flux is the surface integral of the field normal to an oriented surface. For a uniform field over a flat surface, it equals field magnitude times area times the cosine of the angle to the surface normal.
An electric field exerts force on electric charge; it can exist around stationary charges as well as in changing electromagnetic fields.
For maximum positive flux, the field aligns with the surface normal (θ = 0°). A field parallel to the surface has θ = 90° and zero flux. An unknown angle must not be assumed.