Magnets and magnetic fields

The idea

The poles of a magnet are where its field is strongest. Like poles repel; unlike poles attract. A permanent magnet has its own magnetic field; an induced magnet becomes magnetic only when placed in a magnetic field, and induced magnetism always causes attraction. Magnetic field lines point from north to south; the field is strongest where lines are closest. A magnetic compass contains a small bar magnet that points along the Earth's magnetic field.

1. Predict attraction or repulsion.
2. Draw field lines from N to S.
3. Separate permanent and induced magnets.

Watch out An induced magnet always attracts; it cannot repel.