CAPE Physics Unit 2 · 2019 · Paper 1 · Question Q21

Item 21 refers to the following diagram where V_1 and V_2 are input signals. What are the possible values of R_1, R_2 and R_3 if the output voltage V_{\text{out}} = -(3V_1 + 4V_2)?

1. (A)R_1 = 200\text{ k}\Omega, R_2 = 150\text{ k}\Omega, R_3 = 600\text{ k}\Omega
2. (B)R_1 = 200\text{ k}\Omega, R_2 = 400\text{ k}\Omega, R_3 = 600\text{ k}\Omega
3. (C)R_1 = 300\text{ k}\Omega, R_2 = 400\text{ k}\Omega, R_3 = 100\text{ k}\Omega
4. (D)R_1 = 300\text{ k}\Omega, R_2 = 400\text{ k}\Omega, R_3 = 700\text{ k}\Omega

This question uses a figure or table from the paper — you'll see it when you practise.