O-LevelPhysicsMagnetism5054/22 · May/June 2019 · Q75 Marks
Fig. 7.1 shows a copper wire placed on two copper rods in the magnetic field between the poles of a magnet. The crocodile clip A touches the positive terminal of the battery. This causes the copper wire to move. [Figure 7.1]
- (a)On Fig. 7.1, mark with an arrow the direction of the current in the copper wire.[1]
- (b)Explain why the copper wire moves along the copper rods.[2]
- (c)Name two different devices that use this effect. 1. 2.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.
- [B1] current direction in copper wire correct on any part of diagram
- [B1] current and magnetic field create a force
- [B1] or current (in wire) creates a magnetic field
- [B1] left-hand rule mentioned or used
- [B1] or interaction of magnetic fields of magnet and current (catapult effect)
- [B1] (electric) motor or any device that contains a motor
- [B1] (loud)speaker or any device that contains a loudspeaker
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