A bar magnet is attached to one end of a spring. The magnet moves repeatedly into and out of a coil of wire. The coil is connected in series with a switch and a resistor.
When the switch is closed, an induced current flows in the coil.
State what happens to the direction of the induced current each time the magnet changes direction.
When the switch is closed, the maximum distance that the magnet moves from its rest position becomes smaller more quickly than when the switch is open.
Explain why.
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.