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Fall 2010 1 Physics II Lecture 04 Faraday’s and Lenz’ Laws Exam 1 overview

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Lecture 4 demonstrations Large coil with large magnet and ammeter. Fall 2010 2
iClicker Question 4.1 We know that a current in a wire creates a magnetic field. We also know that a magnetic field induces a force on a moving charge or current. Does the presence of a magnetic field induce a current? A)Yes. B) No. C) Maybe so. Explain your response to your neighbor. Fall 2010 3

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Fall 2010 4 Demonstration questions Note direction of induced current. B ammeter coil magnet Is current observed when the coil is held steady so the magnetic flux passes through it? A)Yes B) No Is current observed as the magnet flux is moved into the coil of wire? Does the current depend on the direction in which the magnet is moved?
Fall 2010 5 Maxwell’s Equations – Faraday’s Law 0 0 0 0 Φ + = = Φ - = = dt d i s d B A d B dt d s d E q A d E E B ε μ ε The upper right equation, Faraday’s Law, indicates that a changing magnetic flux gives rise to an electric field.

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Fall 2010 6 Faraday’s Law An emf is produced around a loop when the flux that passes through the loop changes.
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