A technician uses a probe to measure the magnetic field beside a straight metal track in a power distribution unit. The current in the track is reduced without changing its direction. The probe remains in the same position.
Which statement describes the change in the magnetic field at the probe?
The field becomes weaker and its direction is reversed.
The field becomes weaker and its direction stays the same.
The field becomes stronger and its direction stays the same.
The field stays the same strength and its direction is reversed.
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.