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Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction Practice Questions

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The following physics revision questions are provided in support of the physics tutorial on Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction. 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 Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction tutorials. The Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction 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
16.13Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction

Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction Revision Questions

1) What is the magnetic energy stored in the inductor shown in the figure? The inductor is 12 cm long, 4 cm2 thick and it contain 120 turns. The battery produces 24 V and the resistor has a resistance of 0.4Ω. Take μ0 = 4π × 10-7 N/A2.

Physics Tutorials: This image provides visual information for the physics tutorial Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction
  1. 0.12 mJ
  2. 0.868 J
  3. 0.434 J
  4. 0.12 μJ

Correct Answer: C

2) What is the energy density of the magnetic field stored in the inductor shown in the figure?

Physics Tutorials: This image provides visual information for the physics tutorial Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction
  1. 112 500 J/M3
  2. 56 250 J/M3
  3. 4.5 × 1010 J
  4. 4500 J/M3

Correct Answer: B

3) The rheostat in the figure switches between two values, r1 = 6 Ω and r2 = 2 Ω in one second. As a result, a 3V emf is induced in the second coil (on the left). What is the change in the magnetic flux Φ21 produced by the second coil on the inner surface of the fist (single) coil?

Physics Tutorials: This image provides visual information for the physics tutorial Energy Stored in a Magnetic Field. Energy Density of a Magnetic Field. Mutual Induction
  1. 0.06 Wb
  2. 0.60 Wb
  3. 0.75 Wb
  4. 1.33 Wb

Correct Answer: B

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