An electric motor moves a coil back and forth over a fixed magnet at a constant speed. At first, the ends of the coil are not connected. They are then connected to a heating wire, while the motor continues the movement at the same speed.
Compared with when the ends of the coil are not connected, what happens?
The motor must transfer more energy each second because the induced current produces a magnetic field that opposes the movement.
The motor must transfer less energy each second because the induced current produces a magnetic field that opposes the movement.
The motor transfers the same energy each second because the speed of the movement is kept constant.
The motor must transfer more energy each second because the heating wire increases the induced potential difference.
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.