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CAIE A-Level Physics 10.3.2 Comparing P.D.s with a Potentiometer

Practise comparing e.m.f. or potential differences with potentiometer balance lengths, using null readings to calculate unknown and reference values.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • explain how a potentiometer compares potential differences using a balance or null setting
  • use potentiometer readings or lengths to calculate or compare unknown and reference potential differences

10.3.2—The principle of the potentiometer as a means of comparing potential question 1

[Maximum number: 2]

The circuit in (a) is now modified by adding a uniform resistance wire XY and a galvanometer, as shown in Fig. 7.2.

Fig. 7.2 (not to scale)

Fig. 7.2 (not to scale)

The length of the wire XY is 1.2 m . The movable connection Z is positioned on the wire XY so that the galvanometer reading is zero.

Calculate the length XZ along the resistance wire.

length XZ =m [2]
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