Magnetic flux density is the amount of flux per unit cross-sectional area. If the flux remains constant while the area increases, the flux becomes spread over a larger area, so the flux density decreases.
If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
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Question context
This question is part of ⚡ Electrical Engineering within the broader 🛠️ Engineering Essentials subject and appears in the PTS Pakistan Testing Service preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.