Many students find the topic of electromagnetism to be one of the more difficult areas of the A-level physics course. Electromagnetism has its own vocabulary, with terms such as ‘f lux’, ‘flux density’ and ‘flux linkage’. Calculations involve quantities that are not part of everyday experience in the way that, say, mass and temperature are. So you really need to use your imagination to picture what is going on and make every effort to use the terminology with accuracy and precision.
The question discussed in this issue is taken from the June 2010 OCR Physics Unit G495 paper, and is reproduced by kind permission of OCR. The mark scheme, answers and comments that follow are the responsibility of PHYSICS REVIEW and have been neither provided nor approved by OCR.
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