Physics (AS & A Level) · May / June 2020 · Paper 11 · Question 38

In the circuit shown, a battery of negligible internal resistance is connected in series with a pair of fixed resistors R1 and R2. The circuit is to be used to test whether the electromotive force (e.m.f.) of a particular cell is 1.5 V. The cell is connected between terminals X and Y in parallel with R2 and in series with a galvanometer. Which statement about the test is correct?

1. AAny non-zero reading on the galvanometer means the cell has an e.m.f. of 1.5 V.
2. BThe battery does not need to have an e.m.f. of 6.0 V.
3. CThe cell may be connected either way round between X and Y.
4. DThe galvanometer does not need a scale calibrated in amperes.

As printed in the paper