NEIEP Magnetism And Electromagnetism (355)

Does flux density increase or decrease as the distance from a magnet increases?

Increases Decreases Remains the same Oscillates

Correct Answer:

Decreases

Explanation:

Flux density measures how strong the magnetic field is at a point. The magnet’s field lines are crowded near the poles and spread out as you move away. Because the field is produced by a finite source, its strength diminishes with distance—roughly as the distance to the third power in the far field for a dipole. That means doubling how far you are from the magnet reduces the flux density by about eight times, and the general trend is a weaker field the farther you go. It doesn’t stay the same, increase, or oscillate with static distance. So the flux density decreases as distance from the magnet increases.

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