O-LevelPhysicsMagnetism5054/21 · Oct/Nov 2014 · Q74 Marks
A straight length of copper wire lies horizontally between the poles of a U-shaped magnet. Fig. 7.1 shows the two ends of the wire connected to a very sensitive, centre-zero ammeter. [Figure 7.1] The copper wire is moved upwards slowly between the two magnetic poles. The needle on the ammeter deflects to the right.
- (a)Explain why the needle on the ammeter deflects.[2]
- (b)The wire is moved downwards very quickly between the two magnetic poles. State what happens to the needle on the ammeter.[1]
- (c)State what happens to the needle on the ammeter when the copper wire is moved horizontally between the two poles.[1]
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 (Oct/Nov 2014). The mark or mark type is shown in brackets.
- [2] (a) wire cuts field lines
- current/e.m.f./voltage induced
- [1] (b) larger deflection and to the left/opposite direction
- [1] (c) no deflection/current
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