O-LevelPhysicsMagnetism5054/12 · Oct/Nov 2014 · Q341 Mark

The coil of an a.c. generator is rotated and the output is displayed on the screen of a cathode-ray oscilloscope (c.r.o.). The diagram shows the trace on the screen.. Which trace appears on the screen when the speed of rotation of the coil is doubled but the settings on the c.r.o. are unaltered?

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.

ACRO trace with the same amplitude but half the period (double frequency).

BCRO trace with the same amplitude and the same period.

CCRO trace with double the amplitude and half the period (double frequency).

DCRO trace with double the amplitude and double the period (half frequency).

✓ Correct answer

C: CRO trace with double the amplitude and half the period (double frequency).

Oracle Prep sorts past-paper questions by topic, so you can drill Magnetism and see which topics are most likely to come up next.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content