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7.3 Induced potential, transformers and the National Grid (HT only)

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Question 5

A pipe contains a liquid that conducts electricity. A constant magnetic field acts at right angles to the length of the pipe. Two electrodes are positioned on opposite sides of the pipe and connected to a sensitive voltmeter. The liquid is pumped through the pipe at a steady speed, and the voltmeter shows a non-zero reading.

Which action causes the potential difference between the electrodes to become zero?

[1]
A

Stopping the flow while keeping the magnetic field constant

B

Increasing the field strength while the flow continues unchanged

C

Reversing the direction of flow without changing its speed

D

Pumping the liquid faster through the same magnetic field

Markscheme

7.3 Induced potential, transformers and the National Grid (HT only) Questions

  1. GCSE
  2. /Physics
  3. /7.3 Induced potential, transformers and the National Grid (HT only)

96 exam-style questions on AQA GCSE Physics 7.3 Induced potential, transformers and the National Grid (HT only), covering 7.3.1 Induced potential (HT only), 7.3.2 Uses of the generator effect (HT only), 7.3.3 Microphones (HT only), and 7.3.4 Transformers (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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