Physics (AS & A Level) · Oct / Nov 2018 · Paper 12 · Question 38

Two cells are investigated using a potentiometer. At the balance point, cell X gives a reading of 44 cm and cell Y gives a reading of 70 cm. Which statement is not correct?

1. AA potentiometer balance point results in zero current through the galvanometer.
2. BAt the balance point, the current through resistor R in both circuits is the same.
3. CThe electromotive force (e.m.f.) of cell X is larger than that of cell Y.
4. DThe value of the e.m.f. of each of the cells X and Y is less than 6 V.

As printed in the paper