A magnetic force balance contains a straight conductor at right angles to a magnetic field. A technician can adjust the magnetic flux density, the current and the length of conductor inside the field.
Which proposed adjustment would halve the force on the conductor?
The magnetic flux density is doubled, the current is halved and the length inside the field is halved
The magnetic flux density is halved, the current is halved and the length inside the field is unchanged
The magnetic flux density is doubled, the current is halved and the length inside the field is unchanged
The magnetic flux density is halved, the current is doubled and the length inside the field is doubled
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.