Magnetic flux

Definition

Magnetic flux quantifies the total magnetic field passing through a given area. It is measured in Weber (Wb) and mathematically given by $\Phi_B = B \cdot A \cdot \cos(\theta)$.

5 Must Know Facts For Your Next Test

1. Magnetic flux depends on the strength of the magnetic field, the area it penetrates, and the angle between the field and the normal to the surface.
2. Faraday's Law states that a change in magnetic flux induces an electromotive force (emf) in a circuit.
3. The SI unit of magnetic flux is the Weber (Wb).
4. $1 \, Wb = 1 \, T \cdot m^2$, where T is Tesla, the unit for magnetic field strength.
5. A uniform magnetic field that is perpendicular to a surface area maximizes magnetic flux.

Review Questions

• What are the three factors that determine magnetic flux?
• How does Faraday's Law relate to changes in magnetic flux?
• What is the SI unit for measuring magnetic flux?

Related terms

Electromotive Force (emf): The voltage generated by changing magnetic fields or other sources, which drives current through a circuit.

Faraday’s Law: A fundamental law stating that a change in magnetic flux through a loop induces an emf proportional to this change.

Weber (Wb): (SI Unit) A measure of magnetic flux equivalent to one Tesla meter squared ($T \cdot m^2$).