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AQA GCSE Triple Science – Physics Practice Test

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What is a magnetic field line?
Correct Answer:
A line showing the direction of the magnetic field; density indicates field strength.
Explanation:
Magnetic field lines are a way to picture the magnetic field in space. Along each line, the tangent shows the direction a magnetic north pole would experience. The closer the lines are, the stronger the field in that region. They exist both outside and inside magnets, forming closed loops from the magnet’s north to its south outside, and returning inside. That’s why the best description is that a line shows the direction of the magnetic field, and line density indicates field strength. The other ideas don’t fit: magnetic monopoles aren’t what these lines mark, the lines don’t trace the path of an electric current, and the field is represented everywhere, not just inside magnets.

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