This question is about magnetic fields and electromagnets.
A bar magnet is placed on a flat surface, with its North pole N\text{N}N on the left and its South pole S\text{S}S on the right.
State the direction of the magnetic field lines outside the magnet.
State where the magnetic field of the bar magnet is the strongest, and describe how this is shown by the spacing of the field lines.
A student wraps a coil of insulated wire around a cylindrical metal core. The coil is connected in series with a battery and a switch.
State the name given to this device.
Initially, a soft iron core is used. The student closes the switch, and several steel paperclips are attracted to the end of the core. Describe what happens to the paperclips when the switch is opened, and explain why this occurs.
The student replaces the soft iron core with a steel core. The switch is closed, attracting the paperclips again, and then opened. Describe what happens to the paperclips now, and explain why this is different from the soft iron core.
169 exam-style questions on CIE IGCSE Physics Simple phenomena of magnetism, covering Simple phenomena of magnetism. Each one has a worked solution and a mark scheme showing where the marks go.