2016 · M/J · 5054/21 | Q7

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75-mark sittingChoose one alternative where offered and two Section B questions; practice marks across routes are not combined.

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Question 76 marks · Practise this topic →

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Available practice: 73 of 75 marks. Parts 7(a) await marking support. Scores cover available parts only. Theory Paper 2: Section A is compulsory and Section B offers a choice of two questions. Four published mark-scheme discrepancies across the two variants are held from automatic marking.

(a)Fig. 7.1 shows part of a loudspeaker. A coil is attached to a paper cone and is suspended freely within a cylindrical magnet. Explain why a current in the coil causes the paper cone to move.

Fig. 7.1 — see the question text for what it shows

Answer guidance

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

[2 marks]

This part is shown as printed, but its marks conflict with the published mark scheme. It is not scored.

(b)Fig. 7.1 shows part of a loudspeaker. A coil is attached to a paper cone and is suspended freely within a cylindrical magnet. Describe and explain the movement of the cone when there is an alternating current in the coil.

Answer guidance

Describe Say what happens, in order. Reasons are not required unless the question also asks why.

[2 marks]

(c)Fig. 7.1 shows part of a loudspeaker. A coil is attached to a paper cone and is suspended freely within a cylindrical magnet. The loudspeaker produces sound of frequency 500 Hz. The speed of sound is 320 m / s. Calculate the wavelength of the sound produced.

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[2 marks]

5054/21/M/J/16Cambridge O Level Physics 5054 · May/June 2016 · Paper 2 variant 1 · Question 7