Physics II - Lecture 6 (Faraday Lenz and Inductance)

Physics II - Lecture 6 (Faraday Lenz and Inductance) -...

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1 Physics 1200 Lecture 06 Faraday’s Law and Lenz’Law Inductance Transformers!* Spring 2011 * Roll out!
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iClicker Question 6.01 – 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 constant magnetic field induce a current in a wire loop? A)Yes. B) No. CDE) Maybe so. Explain your response to your neighbor. Spring 2011 3
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Spring 2011 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? A) Yes B) No Does the current depend on the direction in which the magnet is moved?
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iClicker question 6.02 The magnetic field in the image to the left is contained within the small rectangle and increasing with time. Which of the following statements properly describes sum of the potentials across the battery and resistor? Spring 2011 5 V xxxx xxxx xxxx R 0 0 0 A) B) C) V iR V iR V iR   
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Spring 2011 6 Maxwell’s Equations – Faraday’s Law 0 0 0 0 dt d i s d B A d B dt d s d E q A d E E B The upper right equation, Faraday’s Law, indicates that a changing magnetic flux gives rise to an electric field.
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Spring 2011 7 Faraday’s Law An emf is produced around a loop when the magnetic flux that passes through the loop changes. B loop d EMF dt  , therefore (Maxwell's Eq.) B EMF E ds d E ds dt   
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Lenz’ Law • If we make the Faraday’s Law loop out of a conducting wire, the induced emf causes current to flow. ( I=Emf/R ) • The induced current in a loop opposes the change in magnetic flux.
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Physics II - Lecture 6 (Faraday Lenz and Inductance) -...

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