| Date | May 2014 | Marks available | 1 | Reference code | 14M.1.HL.TZ1.25 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 25 | Adapted from | N/A |
Question
The graph shows the variation with time t of the power P produced in a coil that is rotating in a region of uniform magnetic field.
Which of the following describes the average power produced and the period of rotation of the coil?
Markscheme
B
Examiners report
This was the most difficult question in the paper for the candidates. Perhaps a simple sketch of a coil in a magnetic field would have helped them realise that there will be two occasions in the cycle when the power output is zero. Hence A and B (the most common options) must be incorrect. This is a sin2 curve and the average power will be just half the maximum.
Syllabus sections
Additional higher level (AHL) » Topic 11: Electromagnetic induction » 11.2 – Power generation and transmission
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