Magnetic flux through a surface is defined as
Correct answer: A. B times A times cos theta, where theta is the angle between B and the normal to the surface
- A. B times A times cos theta, where theta is the angle between B and the normal to the surface
- B. B times A times sin theta
- C. B divided by A
- D. B times A only, whatever the orientation
Explanation
Flux counts the field lines threading the surface, so it is greatest when the field is perpendicular to the surface, meaning parallel to its normal, and zero when the field lies in the plane of the surface. Its unit is the weber. Every question on induction depends on tracking how this quantity changes with time.
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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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