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Physics · May / June 2019 · Paper 12 · Question 37

5054The a.c. generator

A coil is rotating in a magnetic field. The coil is connected to an oscilloscope. The diagram shows the trace on the screen of the oscilloscope. [oscilloscope trace showing two full sine waves] The coil now speeds up and rotates twice as fast. Which diagram shows the new trace?

  1. A[trace showing four full sine waves with same amplitude]
  2. B[trace showing four full sine waves with larger amplitude]
  3. C[trace showing one full sine wave with same amplitude]
  4. D[trace showing one full sine wave with larger amplitude]

As printed in the paper

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Correct answer: B. [trace showing four full sine waves with larger amplitude]

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