A coil connected to a cell and a switch is placed next to a second coil. The second coil is connected to a centre-zero ammeter. The two coils are not electrically connected, and nothing moves during the experiment.
When the switch is closed, the ammeter pointer moves to the right.
Which action makes the ammeter pointer move to the left?
Leaving the switch closed so that the current in the first coil stays steady.
Opening the switch so that the current in the first coil falls to zero.
Adding more turns to the second coil and then closing the switch.
Putting a soft iron core inside both coils and then closing the switch.
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.