A plotting compass is placed beside one end of an iron-cored electromagnet. The compass needle points along the magnetic field produced by the electromagnet. The current is reversed without changing its size.
What happens to the compass needle?
The needle keeps its direction because the iron core fixes the poles
The needle makes one complete turn and finishes in its original direction
The needle turns through 90° because the field becomes perpendicular
The needle turns through 180° and points in the opposite direction
90 exam-style questions on AQA GCSE Physics 7.2 The motor effect, covering 7.2.1 Electromagnetism, 7.2.2 Fleming's left-hand rule (HT only), 7.2.3 Electric motors (HT only), and 7.2.4 Loudspeakers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.