A d.c. motor is used in an electric fan. The diagram shows the coil positioned with its plane parallel to the magnetic field lines. Using Fleming's left-hand rule, if the magnetic field direction is from left to right (North to South) and the current in the top side of the coil flows into the page, in which direction does the force act on the top side of the coil?

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Question

A d.c. motor is used in an electric fan. The diagram shows the coil positioned with its plane parallel to the magnetic field lines. Using Fleming's left-hand rule, if the magnetic field direction is from left to right (North to South) and the current in the top side of the coil flows into the page, in which direction does the force act on the top side of the coil?

Accepted Answer

upwards — Award 1 mark for correct application of Fleming's left-hand rule. First finger points left to right (field), second finger points into the page (current), thumb points upwards (force). B is incorrect — this would be the force if the current direction were reversed. C and D are incorrect — the force is perpendicular to both the field and current directions.

Answer

into the page

Answer

upwards

Answer

downwards

Answer

out of the page

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