Physics (AS & A Level) · Feb / March 2022 · Paper 12 · Question 37

In the circuit shown, the cells have negligible internal resistance and the reading on the galvanometer is zero. [circuit diagram: 4.0 V cell at top, 9.0 Ω and 3.0 Ω resistors in top branch, 6.0 Ω and R in bottom branch, galvanometer between midpoints, 9.0 V cell at bottom] What is the value of resistor R ?

1. A2.0 Ω
2. B6.0 Ω
3. C12 Ω
4. D18 Ω

As printed in the paper