A plotting compass is placed next to a long straight wire.
A current is switched on in the wire.
Which statement describes and explains what happens to the compass needle?
It stays still, because the wire is not made of a magnetic material
It moves, because the current produces a magnetic field around the wire
It stays still, because a current only causes a heating effect in a wire
It moves, because the wire is turned into a permanent bar magnet
44 exam-style questions on OCR GCSE Physics 4.1 Magnets and magnetic fields, covering 4.1.1 Magnetic poles, attraction and repulsion, 4.1.2 Permanent and induced magnets, 4.1.3 The magnetic field of a magnet, 4.1.4 Compasses and the Earth's magnetic field, 4.1.5 The magnetic field around a current-carrying wire, 4.1.6 Field strength, current and distance, and 4.1.7 Solenoids and electromagnets. Each one has a worked solution and a mark scheme showing where the marks go.