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CAIE A-Level Physics AS 10.3.2 The Principle of the Potentiometer As a Means of Comparing Potential Questions

Explain how a potentiometer compares potential differences.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Explain how a potentiometer compares potential differences.

CAIE A-Level Physics AS 10.3.2 The Principle of the Potentiometer As a Means of Comparing Potential Questions question 1

[Maximum number: 1]

The diagram shows a potentiometer circuit used to compare the electromotive forces (e.m.f.), E1E_{1} and E2E_{2}, of two cells.

XY is a uniform resistance wire. The fixed resistor has resistance R.
A sliding contact is moved along the wire XY . When the sliding contact is at position P , the galvanometer reads zero.

Figure for Question CAIE A-Level Physics AS 10.3.2 The Principle of the Potentiometer As a Means of Comparing Potential Questions question 1 — CAIE A-Level Physics AS

The circuit is changed so that the galvanometer reads zero when the sliding contact is at a new position to the left of P.

Which change could have been made to the circuit?

A

The wire X Y was replaced with one of lower resistance.

B

E2E_{2} was increased.

C

E1E_{1} was decreased.

D

R was decreased.

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