Physics (AS & A Level) · Oct / Nov 2025 · Paper 22 · Question 5

Fig. 5.1 shows a circuit containing a battery, two fixed resistors X and Y, and a light-dependent resistor (LDR) Z. 100 Ω 4.7 Ω 5.0 V X I2 I1 Z Y Fig. 5.1 The battery has electromotive force (e.m.f.) 5.0 V and internal resistance 4.7 Ω. The current in X is I1 and the current in Y is I2. The resistance of X is 100 Ω. The resistance of Z varies with the intensity of light incident on it as shown in Fig. 5.2. 0 0 50 100 intensity / W m–2 resistance / Ω 150 200 250 100 200 300 400 500 Fig. 5.2

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