A physics teacher builds a simple electromagnetic device to demonstrate sorting different scrap metals. She uses the device to pick up a mixture of iron staples and steel paperclips.
Describe the construction of a basic electromagnet that could be used for this demonstration.
When the teacher switches off the electrical current to the electromagnet, the iron staples fall off immediately, but the steel paperclips remain attached to the electromagnet's core. Explain this observation.
7 exam-style questions on Edexcel IGCSE Physics Electromagnetism. Each one has a worked solution and a mark scheme showing where the marks go.