Lec-15 - If the loop is rotated mechanically by an external...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Previous Lecture Faraday’s Law: I E · d l = - d dt Z B · d A = - Z d B dt · d A E is related to B ∂t . Lenz’s Law – p.
Background image of page 1

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

View Full DocumentRight Arrow Icon
Today A Big Generalization of Faraday’s Law Mutual inductance M Self inductance L – p.
Background image of page 2
Example 29.1 – p.
Background image of page 3

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

View Full DocumentRight Arrow Icon
A Big Generalization We discussed Faraday’s Law in terms of the time-dependent flux of a magnetic field through a loop of wire. The emf is an electric field that pushes charge around the wire loop. – p.
Background image of page 4
A Big Generalization We discussed Faraday’s Law in terms of the time-dependent flux of a magnetic field through a loop of wire. The emf is an electric field that pushes charge around the wire loop. You don’t need the loop! There is a fundamental relation between E and B /∂t . – p.
Background image of page 5

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

View Full DocumentRight Arrow Icon
Example 29.1 without loop – p.
Background image of page 6
Changing B induces E If B increases, the electric field lines are circular. – p.
Background image of page 7

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

View Full DocumentRight Arrow Icon
AC Generator
Background image of page 8
Background image of page 9

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

View Full DocumentRight Arrow Icon
Background image of page 10
Background image of page 11

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

View Full DocumentRight Arrow Icon
Background image of page 12
Background image of page 13
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: If the loop is rotated mechanically by an external power source (e.g., water flowing over a dam), the flux through the loop varies sinu-soidaly: = BA cos t E =-d dt = BA sin t. The output of the generator is an ac voltage. p. Nota Bene Section 29-7 (Displacement current and Maxwells Equations) is important. We will come back to it. p. Mutual Inductance A changing current in one coil will induce a current in the second coil. p. 1 Mutual Inductance One coil inside another: p. 1 Behavior of an Inductor p. 1 Building up B takes time The animation shows how the magnetic field of a solenoid builds up as a function of time after the current starts to flow through the coils. p. 1...
View Full Document

This note was uploaded on 02/29/2008 for the course PHYSICS 21 taught by Professor Hickman during the Spring '08 term at Lehigh University .

Page1 / 13

Lec-15 - If the loop is rotated mechanically by an external...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online