A vibration sensor contains a straight conducting rod connected to a data logger. The rod is positioned between the poles of a magnet assembly.
During calibration, the magnet assembly is held stationary and the rod starts moving vertically downwards. The data logger initially records a positive potential difference.
The sensor is returned to its starting arrangement before each trial. All movements are vertical and at the calibration speed.
Which trial is matched with the correct initial reading?
Move the magnet assembly downwards past the stationary rod; the initial reading is negative.
Move the rod and magnet assembly downwards together at the same speed; the initial reading is positive.
Move the magnet assembly upwards past the stationary rod; the initial reading is negative.
Move the rod upwards through the stationary magnet assembly; the initial reading is positive.
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.