O-LevelPhysicsMagnetism5054/21 · May/June 2016 · Q76 Marks
Fig. 7.1 shows part of a loudspeaker. A coil is attached to a paper cone and is suspended freely within a cylindrical magnet. [Figure 7.1]
- (a)Explain why a current in the coil causes the paper cone to move.[2]
- (b)Describe and explain the movement of the cone when there is an alternating current in the coil.[2]
- (c)The loudspeaker produces sound of frequency 500 Hz. The speed of sound is 320m/s. Calculate the wavelength of the sound produced.[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 2016). The mark or mark type is shown in brackets.
- [C1] (current in coil) creates magnetic field or current is at right angles to magnetic field (of permanent/cylindrical magnets)
- [B1] into and out of magnet or left and right or backwards and forwards
- [B1] current is one way then reverses (so reverses force)
- [C1] (λ=) v/f numerically or algebraic in any form
- [A1] 0.64 m
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