A wire in a magnetic field has a force acting on it. The magnetic flux density is then doubled and the length of the wire inside the field is halved. The current stays the same. What happens to the force?
It becomes twice as large as it was before
It stays exactly the same size as it was before
It becomes half as large as it was before
It becomes four times as large as before
39 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.