A flexible metal strip vibrates in a magnetic field. The movement induces a potential difference between the ends of the strip. The ends are connected to a sensitive current meter through an open switch.
Which action will make the meter detect an induced current?
Make the strip vibrate at a higher frequency.
Replace the magnet with a stronger magnet.
Close the switch between the strip and the meter.
Turn the magnet around so its poles are reversed.
96 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.