Physics – 4.1 Simple phenomena of magnetism | e-Consult
4.1 Simple phenomena of magnetism (1 questions)
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When a bar magnet is placed in a non-uniform magnetic field, the pattern of the magnetic field lines around it will be distorted. The field lines will bend and curve as they interact with the external field. Specifically, the magnetic field strength will vary across the magnet's surface. This variation in magnetic field strength will result in non-uniform forces acting on the magnet's poles.
- At the pole facing the stronger part of the external field: The force will be stronger and potentially push the pole towards the stronger field.
- At the pole facing the weaker part of the external field: The force will be weaker and potentially pull the pole away from the weaker field.
The net effect of these non-uniform forces will be to cause the bar magnet to rotate and align itself with the external magnetic field. This is the principle behind magnetic compasses and magnetic separators. The direction of the net force will depend on the relative orientation of the magnet's magnetic field and the external field.