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The weekly assignments for physics 122, including due dates for homework and reading materials. The document also covers the concepts of mutual induction and lenz's law, explaining how a change in current in one circuit generates an emf in another, and how lenz's law states that the induced emf always acts to oppose the change in magnetic flux. Figures and clicker questions to test understanding.
Typology: Assignments
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HW 8: Due Friday. HW 9: Chapter 27, problems 20, 28, 33, 38, and chapter 28, problem 26. Due Wednesday one week from today. Mastering Physics: New assignment is due one week from Thursday. Reading: Read chapter 28, section 3 only. Begin chapter 29 through section 29.3 for Friday.
Mutual Induction: A change in current in one circuit generates an EMF in the other. This principle is behind the transformer, and one form of the wireless transmission of power. Having the pickup be a coil of N turns rather than a single loop mulitplies the induced EMF by N.
This version of Faraday's Law is almost always true! There are some EMF s which don't have changing magnetic flux, however. As with the previous EMF definition, the convention is that positive EMF is “downhill”: in the direction of the current. There is yet another right-hand-rule for this: if your right-hand thumb points along the convention of positive flux (on the right of the equation), then your right hand fingers curl in the positive EMF convention (on the left side of the equation).
Faraday's Law in one final form, which is valid for any STATIONARY loop in space: This says that whenever a magnetic field changes with time, electric fields are generated! The electric fields are there in space no matter what (whether a conductor is there to make a current flow, or not).
Lenz' Law: Induced EMF always acts in a direction to oppose the change in magnetic flux. After a bit of practice, Lenz' Law is MUCH easier to use than the complicated right-hand-rule version given earlier! You are advised to become a “black belt” master user of Lenz' Law.
Clickers: What is responsible for the braking action of the conductor?
Mutual Induction: A change in current in one circuit generates an EMF in the other. For Self-Induction, the original circuit is the SAME as the induced- EMF circuit! The SI unit of induction is the Henry, abbreviated H. Inductors give inertia to currents in circuits.
