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Electric and gravitational fields

Physics develops problem-solving skills, and A-level examiners are free to present questions in contexts that may not be immediately familiar. Students can struggle with these unfamiliar contexts, but the trick is to look for the physics at work. The physics in an exam question must be part of the A-level specification, even if the context is not

Examiners know the importance of problem-solving skills and do what they can to promote them, most obviously by setting questions in which ideas have to be drawn from across the specification rather than being solely about one topic area. Such questions are sometimes set in an unfamiliar context and require you to relate the context to something that you have seen before, often by focusing on key details.They may also require a mix of numerical work and written explanation in order to get to the end of the question.

The new range of A-level qualifications includes questions of this sort. A prime example comes from one of the AQA specimen papers, AQA-74082-SQP (Question 01). The context is an industrial process for separating out different minerals from an ore. A successful student will have demonstrated a sound grasp of electrostatics and the mechanics of freefall in a gravitational field, as well as the ability to explain interlinked ideas in a lucid manner.

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Magnetic force on a current-carrying wire

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