Phys 0175 - Lecture 27

# Phys 0175 - Lecture 27 - Lecture 27 (Mar. 23, 2009):...

This preview shows pages 1–4. Sign up to view the full content.

Lecture 27 (Mar. 23, 2009): Induction and Inductance (cont’d): Induction and energy transfers Eddy currents Motional emf Illustrative examples

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Summary of previous lecture: cos B B dA B dA φ Φ = = r r g Magnetic flux: [SI units: T·m 2 = Wb] Induced emf = = B d dt Φ - E Faraday’s Law of Induction: Lenz’s Law: The induced current always has a direction such that the magnetic field due to the induced current opposes the change in the magnetic flux that induced it.
Induction and energy transfers: 2 3 1 2 2 2 2 2 2 2 2 ; hence F= and F does work at the rate The induced current generates heat at the rate F F ixB F iLB BLv B L v P Fv iLBv LBv R R BLv B L v P i R R R R = - = = = = = = = = = r r Lenz’s Law implies that positive work must be done by an outside force F in order to produce an induced current. Thus Lenz’s Law is really an energy conservation law. Earlier we have seen that in this situation the

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 04/06/2009 for the course PHYS 0175 taught by Professor Koehler during the Spring '08 term at Pittsburgh.

### Page1 / 9

Phys 0175 - Lecture 27 - Lecture 27 (Mar. 23, 2009):...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online