A magnet is pushed into a coil connected to a resistor. A student claims that the induced field should attract the approaching magnet, making it speed up without any extra energy input.
Which statement explains why this claim is incorrect?
The induced field assists the approach, so the magnet supplies new electric charge.
The induced field opposes the approach, so work supplies the electrical energy.
The induced field opposes the approach, so electrical energy is not transferred.
The induced field assists the approach, so resistance removes the magnetic force.
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.