2022 · Specimen · 9702/04 | Q6

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Question (6 of 12)2 marks · Practise this topic →

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Available practice: 77 of 100 marks. Parts 1(b), 4(b)(i), 4(c), 6(a)(ii), 6(b)(ii), 7(a)(i), 7(a)(ii), 9(b)(i), 9(c), 10(b)(ii) await marking support. Scores cover available parts only.

A thin slice of conducting material has its faces PQRS and VWXY normal to a uniform magnetic field of flux density B. Electrons enter the slice at right-angles to face SRXY. A potential difference, the Hall voltage V_H, is produced between two faces of the slice.

(a)(i)Use letters from Fig. 6.1 to identify the two faces between which the Hall voltage is produced.

Fig. 6.1 — see the question text for what it shows

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[1 mark]

A thin slice of conducting material has faces PQRS and VWXY normal to a uniform magnetic field of flux density B; electrons enter the slice at right-angles to face SRXY.

The Hall voltage V_H is given by the expression V_H = BI/(ntq).

(b)(i)Use the letters in Fig. 6.1 to identify the distance t.

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[1 mark]

9702/04/SP/22Cambridge International AS & A Level Physics 9702 · Specimen 2022 · Paper 4 · Question 6