MJ22 P23 Q6 Circuit Switches | May/June 2022 | Cambridge A Level 9702 Physics

9702/23/M/J/22: (a) (i) On Fig. 6.1, sketch the I–V characteristic of a filament lamp. (ii) Explain the shape of the line in (a)(i).

(b) A conducting wire has length 5.8 m and cross‑sectional area 3.4 × 10–8 m2. The resistivity of the metal of the wire is 5.6 × 10–8 Ω m. Calculate the resistance of the wire.

(c) A resistor of resistance R is placed in a circuit with a cell of negligible internal resistance, two switches S1 and S2, a second resistor of resistance 2R and three ammeters X, Y and Z. The circuit is shown in Fig. 6.2. The reading on X is 1.0 A when S1 is open and S2 is closed. Complete Table 6.1.
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