Magnetic flux and flux density are related by___________________?
Correct answer: B. magnetic flux = flux density x area
- A. magnetic flux = flux density / area
- B. magnetic flux = flux density x area
- C. flux density = magnetic flux area
- D. flux density = magnetic flux x area
Explanation
Magnetic flux through an area is Φ = BA when the field is perpendicular to the area, where Φ is in Wb, B is in Wb m^-2, and A is in m^2. More generally, Φ = BA cosθ. The likely wrong choice is a, which reverses the relationship between flux and area.
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About Magnetic Flux
Magnetic flux measures the magnetic field passing through a surface, calculated for a uniform field as Φ = BA cos θ, where θ is the angle between the field and the surface normal. Questions involve area, field strength and orientation, the weber as its unit, and the distinction between flux and magnetic field.
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