A potentiometer circuit may be used to determine the unknown electromotive force (e.m.f.) $$$E$$$ of a cell. The circuit diagrams shown include a battery of known e.m.f. and negligible internal resistance, a uniform resistance wire XY and a galvanometer. Which circuit diagram shows a suitable arrangement for determining $$$E$$$ ?

Physics

IGCSE&ALevel

CAIE

Exam No：9702_s25_qp_14 Year：2025 Question No：36

Answer:

Knowledge points:

10.3.1 understand the principle of a potential divider circuit as a source of variable p.d.

10.3.2 recall and solve problems using the principle of the potentiometer as a means of comparing potential differences

10.3.3 understand that an electronic sensor consists of a sensing device and a circuit that provides an output that can be registered as a voltage

10.3.4 explain the use of thermistors, light-dependent resistors and strain gauges in potential dividers to provide a potential difference that is dependent on temperature, illumination and strain respectively

Answer:

Knowledge points:

Solution:

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