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Ampere's Law Practice Questions

The following physics revision questions are provided in support of the physics tutorial on Ampere's Law. In addition to this tutorial, we also provide revision notes, a video tutorial, revision questions on this page (which allow you to check your understanding of the topic) and calculators which provide full, step by step calculations for each of the formula in the Ampere's Law tutorials. The Ampere's Law calculators are particularly useful for ensuring your step-by-step calculations are correct as well as ensuring your final result is accurate.

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16.6Ampere's Law

Ampere's Law Revision Questions

1) A 4 mT magnetic field is produced at an Amperian loop taken outside a long straight conductor when current I is flowing through it as shown in the figure (it gives an upper view).

Physics Tutorials: This image provides visual information for the physics tutorial Ampere's Law

What is the magnitude of current flowing through the wire?

  1. 1.6π A
  2. 1.6 A
  3. 16 A
  4. 160 A

Correct Answer: D

2) A 4 cm thick cable (radius = 2 cm) carries 12A current. What is the magnetic field (magnitude and direction) 6 mm away from the centre of cross-section of the cable? (There is a ⊗ symbol at centre of figure)

Physics Tutorials: This image provides visual information for the physics tutorial Ampere's Law
  1. 36 mT clockwise
  2. 36 μT clockwise
  3. 36 μT anticlocwise
  4. 0.72 μT anticlockwise

Correct Answer: B

3) What is the current flowing through the windings of a toroid containing 1000 turns if the magnetic field inside the toroid 4cm away from its centre is 0.045 T?

Physics Tutorials: This image provides visual information for the physics tutorial Ampere's Law
  1. 9A
  2. 4.5A
  3. 9π A
  4. 4.5π A

Correct Answer: A

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  5. Continuing learning magnetism - read our next physics tutorial: Faraday's Law of Induction

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