If the magnetic field is parallel to a surface, then the magnetic flux through the surface is:
Correct answer: A. Zero
- A. Zero
- B. Small but not zero
- C. Infinite
- D. Larger than 1
Explanation
The magnetic field vector makes a 90˚ angle with the area vector since area vector is always perpendicular to the surface we choose. This is further demonstrated in the diagram below. As, Φ = NBAcosθ When the magnetic field is parallel to a surface θ=90˚ =cos 90 = 0
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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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