O-LevelPhysicsMagnetism5054/22 · May/June 2021 · Q76 Marks
Fig. 7.1 shows part of a simple d.c. electric motor. [Figure 7.1] The motor is connected to a battery with the positive terminal of the battery connected to terminal A.
- (a)Explain why the coil turns in the direction shown.[3]
- (b)(i)Explain why this happens.[2]
- (b)(ii)Suggest one other way to increase the turning effect of the motor.[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 (May/June 2021). The mark or mark type is shown in brackets.
- [B1] current (in coil) is (any one from) • away from A or towards B • from positive to negative • at right angles to magnetic field • makes the coil an (electro)magnet
- [B1] left-hand rule stated, mentioned or used or force at right angle to field and current or top face of coil is a S-pole / bottom face a N-pole
- [B1] forces in opposite directions (on opposite sides causing rotation) or unlike poles attract/like poles repel (only if coil is electromagnet)
- [B1] stronger magnetic field or (soft) iron becomes (temporary) magnet / magnetises easily
- [B1] stronger / larger force
- [B1] larger current / larger voltage / more turns on coil / wider coil / larger coil / thicker wire / stronger magnet
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