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What is magnetic flux?
The amount of magnetic field passing through a surface.
Define area vector.
A vector that points perpendicular to the plane of the surface; for closed surfaces, it points outward.
What is the unit of magnetic flux?
Weber (Wb). 1 Wb = 1 T·m².
What is infinitesimal area element?
Represents a tiny area of the surface. Its direction matches the area vector at that point.
What is the significance of the sign of magnetic flux?
The sign indicates whether the magnetic field is entering or leaving the surface.
What is the difference between calculating flux with a constant magnetic field and a varying magnetic field?
Constant field: Use $\Phi_{B} = \vec{B} \cdot \vec{A}$. Varying field: Use $\Phi_{B} = \int \vec{B} \cdot d\vec{A}$ (integration).
Compare positive and negative magnetic flux.
Positive Flux: $\vec{B}$ and $\vec{A}$ point in similar directions. Negative Flux: $\vec{B}$ and $\vec{A}$ point in opposite directions.
Compare scalar and vector quantities.
Scalar: Magnitude Only. Vector: Magnitude and Direction.
Compare magnetic flux and magnetic field.
Magnetic flux: the amount of magnetic field 'stuff' passing through a surface. Magnetic field: a field of force produced by a moving electric charge.
Compare Faraday's Law and Lenz's Law.
Faraday's Law: The change in magnetic flux through a loop induces an electromotive force (EMF). Lenz's Law: The induced current flows in a direction that opposes the change in flux that produced it.
What is the effect of increasing the magnetic field strength on the magnetic flux?
Increases the magnetic flux.
What happens to magnetic flux if the angle between the magnetic field and the area vector is 90 degrees?
The magnetic flux is zero.
What is the effect of changing magnetic flux through a loop?
Induces an electromotive force (EMF) according to Faraday's Law.
What causes a positive magnetic flux?
The magnetic field and area vector pointing in similar directions (acute angle).
What causes a negative magnetic flux?
The magnetic field and area vector pointing in opposite directions (obtuse angle).