Which expression gives magnetic flux?
PHYSICS
JAMB 2022
Which expression gives magnetic flux?
- A. qVB sin\(\theta\)
- B. \(\frac{\mu \phi I}{2 \pi r}\)
- C. BA cos \(\theta\)
- D. -N \(\frac{d \phi}{dt}\)
Correct Answer: C. BA cos \(\theta\)
Explanation
the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B over that surface.
It is usually denoted Φ or ΦB. The SI unit of magnetic flux is the weber
Mathematically it is represented asB = Φ/A
where B is magnetic flux density in teslas (T),
Φ is magnetic flux in webers (Wb), and
A is area in square meters (m2).
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