O-LevelPhysicsMagnetism5054/11 · May/June 2021 · Q341 Mark
The diagram shows a current-carrying conductor between the poles of a magnet. The force on the wire acts downwards. Four changes are possible. 1 The current is increased. 2 A stronger magnet is used. 3 The current is reversed. 4 The poles exchange positions. Which two changes made together keep the force acting downwards?
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A1 and 3
B2 and 3
C2 and 4
D3 and 4
✓ Correct answer
D: 3 and 4
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