Physics · May / June 2017 · Paper 12 · Question 35

A thermistor and a light-dependent resistor (LDR) are connected in series. A potential difference (p.d.) of 6.0 V is applied across them as shown. The thermistor has a resistance of 6000 Ω in a cold room and 1000 Ω in a warm room. The LDR has a resistance of 2000 Ω in dim light and 500 Ω in bright light. When is the p.d. across the LDR equal to 2.0 V?

1. Ain a cold room with bright light
2. Bin a cold room with dim light
3. Cin a warm room with bright light
4. Din a warm room with dim light

As printed in the paper