Which of the following changes will decrease the strength of an electromagnet?
Increasing the size of the current flowing through the coil
Inserting a soft iron core into the coil
Decreasing the number of turns of wire in the coil
Winding the same number of turns over a shorter length
17 exam-style questions on OCR GCSE Physics Magnets and magnetic fields. Each one has a worked solution and a mark scheme showing where the marks go.