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Lentz Law Practice Questions

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The following physics revision questions are provided in support of the physics tutorial on Lentz 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 Lentz Law tutorials. The Lentz 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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Magnetism Learning Material
Tutorial IDTitleTutorialVideo
Tutorial		Revision
Notes		Revision
Questions
16.8Lentz Law

Lentz Law Revision Questions

1) A closed conducting loop by dimensions 5 cm × 2 cm is pulled out of a 2T uniform magnetic field at constant velocity v. It takes 10 s to the loop to move out of the magnetic field if initially it was entirely within the magnetic field. What is the value of the current induced in the loop after 7s if the resistance of loop is 1 Ω?

Physics Tutorials: This image provides visual information for the physics tutorial Lentz Law
  1. 2 A anticlockwise
  2. 0.0086 A clockwise
  3. 0.00086 A anticlockwise
  4. 0.0002 A clockwise

Correct Answer: D

2) The figure shows three identical circular conducting loops placed inside uniform magnetic fields that are either increasing (Inc) or decreasing (Dec) in magnitude at identical rates. In each figure the dashed line represents a diameter. Which is true for the magnitude of the current induced in the loops?

Physics Tutorials: This image provides visual information for the physics tutorial Lentz Law
  1. iA = iB while iC = 0
  2. iA > iB while iC = 0
  3. iA = iB = 0 while iC > 0
  4. iA = iB = iC

Correct Answer: A

3) The North pole of a bar magnet moves initially away and then towards the coil shown in the figure.

Physics Tutorials: This image provides visual information for the physics tutorial Lentz Law

What is the direction of the induced current (if any) flows through the resistor in both cases?

  1. 1 - due left; 2 - no current is flowing
  2. 1 - due left; 2 - due right
  3. 1 - due right; 2 - due left
  4. No current is flowing through the resistor in either case as there is no battery connected in the circuit

Correct Answer: C

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  5. Continuing learning magnetism - read our next physics tutorial: Inductance and Self-Induction

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