A coil and a bar magnet are fixed to the same trolley. The magnet cannot move relative to the coil. The trolley accelerates along a straight track. There is no other changing magnetic field.
Which statement explains the ammeter reading?
It increases because the speed of the trolley is increasing.
It remains non-zero because the magnet is inside the coil.
It reverses because acceleration changes the magnet's poles.
It remains zero because the field through the coil is unchanged.
92 exam-style questions on Edexcel GCSE Physics 13.1 Inducing a current, covering 13.1.1 Producing an electric current by induction, 13.1.2 Factors affecting the induced potential difference, 13.1.3 Alternators and dynamos, and 13.1.4 Microphones and loudspeakers. Each one has a worked solution and a mark scheme showing where the marks go.