A student is investigating the potential difference in a circuit. The circuit is set up as shown in Fig. 2.1.
E
P
Q
V
[Figure 2.1]
Two resistors P and Q are connected in series to a power supply of electromotive force (e.m.f.) E and negligible internal resistance. Resistor P has resistance P.
The potential difference V across resistor P is measured. The experiment is repeated for different values of P.
It is suggested that V and P are related by the equation
V=(P/(P+Q))E
where Q is the resistance of resistor Q. The value of Q is kept constant.

Q: What topic does this question test?

This question tests D.C. circuits in A-Level Physics (syllabus code 9702). It is worth 15 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Feb/Mar 2017 examination, Paper 5 Variant 2 (9702_m17_qp_52.pdf).

Question

A student is investigating the potential difference in a circuit. The circuit is set up as shown in Fig. 2.1.
E
P
Q
V
[Figure 2.1]
Two resistors P and Q are connected in series to a power supply of electromotive force (e.m.f.) E and negligible internal resistance. Resistor P has resistance P.
The potential difference V across resistor P is measured. The experiment is repeated for different values of P.
It is suggested that V and P are related by the equation
V=(P/(P+Q))E
where Q is the resistance of resistor Q. The value of Q is kept constant.

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