Edexcel A-Level Physics Potential Along Wires

Practise Edexcel A-Level Physics potential along current-carrying wires by reading proportional potential-difference graphs and voltmeter positions.

Exam points

identify p.d. across a uniform wire as directly proportional to the measured wire length
determine voltmeter readings from positions along a uniform current-carrying wire

[Maximum number: 1]

'Resistivity paper' is paper covered with a thin layer of carbon.
The distance between the ends of a piece of resistivity paper is 12.0 cm . The resistivity paper is 4.2 cm wide as shown.

Figure for Question 2.4.74 - Potential along a current-carrying wire question 1 — Edexcel A-Level Physics AS

The resistance between the ends of the resistivity paper is $8.8 \Omega$ .

A student connected the ends of the resistivity paper to a cell of e.m.f. 1.5 V and a voltmeter, as shown.

The connection to the right-hand terminal of the voltmeter was moved to a distance of 3.0 cm from the left-hand side of the resistivity paper.

Determine the reading on the voltmeter.

Reading on voltmeter =

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2.4.74 - Potential along a current-carrying wire question 1