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Lecture 8: Faraday's Law of Induction
February 17, 2026
Reading Assignment
- Read: 27.1-27.3, 27.6 (through p. 537)
- Study: Eqs 27.1a, 27.1b, 27.2; Exs 27.3, 27.5, 27.10
- Ignore: “Diamagnetism” in Section 27.6 (p. 538).
Objectives
- (Continuing objective) Describe applications of the concepts of induction, waves, and light to everyday “real life” situations.
- For a given simple magnetic field and a surface, calculate the magnetic flux.
- Given a situation in which there is a changing magnetic flux, apply Faraday's law to relate the emf, current, or circulation of the \(\vec{E}\)-field to the properties of the magnetic field and of the coil.
- Distinguish situations for which there is or is not an induced emf.
- Apply Lenz's Law to determine the direction of induced emf, electrical currents, eddy currents, magnetic fields, or forces.
Homework
- Wednesday's Assigned Problems: A23, A24, A25; Ch. 27: 1, 2, 11, 13, 28, 37, 47
- Monday's Hand-In Problems: A28; Ch. 27: 14, 40, 46, 48
Notes: This is only the first half of the hand-in set.
Lecture Materials
- Click here for the Lecture overheads. Answers: CT1a - 2; CT1b - 1; CT1c - 1; CT1d - 1; CT1e - 2; CT2 - 2; CT3 - 4; CT4 - 2
Videos of example problems
To see the problem statement, click on the link below. To play the video example, click on the underlined words "Video Demonstration" near the top of the page with the problem statement.- Example #1: Determining the emf in a loop moving into a region with magnetic field.
Pre-Class Entertainment
- Old Man - Neil Young
- Peace Train - Cat Stevens
- Casey Jones - Grateful Dead
- Be OK - Ingrid Michaelson
- Good People - Jack Johnson