What is the SI unit of magnetic flux?

What is the SI unit of magnetic flux?

• A. Weber (Wb)
• B. Tesla (T)
• C. Henry (H)
• D. Volt (V)

Answer: (A)

Magnetic flux measures how much of the magnetic field passes through a surface. Its SI unit is the weber. The flux is defined as φ = ∮ B · dA, so its units come from the magnetic field times area. The field carries units of tesla and the area is square meters, giving tesla·m^2. Since 1 tesla equals 1 weber per square meter, that product is a weber, and equivalently 1 weber also equals 1 volt-second. This matches Faraday’s law, where the induced emf is the negative rate of change of flux. The tesla describes field density, not total flux; Henry is inductance, and Volt is voltage.

Magnetic flux measures how much of the magnetic field passes through a surface. Its SI unit is the weber. The flux is defined as φ = ∮ B · dA, so its units come from the magnetic field times area. The field carries units of tesla and the area is square meters, giving tesla·m^2. Since 1 tesla equals 1 weber per square meter, that product is a weber, and equivalently 1 weber also equals 1 volt-second. This matches Faraday’s law, where the induced emf is the negative rate of change of flux. The tesla describes field density, not total flux; Henry is inductance, and Volt is voltage.