This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: ‘Magnetic force’ approach: B v q E q F tot ! ! ! ! ! + = ! = vB E L vB emf ! = I Use Faraday law: dt d emf mag ! " = A B mag ! = !" # t Lv B ! = " L vB t emf mag t ! " # = # #$ = lim I Faraday’s Law and Motional EMF dt d emf mag ! " = A n B ˆ ! = " ! ! cos Bwh = " ¡ t ( ) = Bwh cos ¢ t ( ) ( ) t dt d Bwh dt d emf mag ! cos " = # " = ( ) t Bwh emf ! ! sin = I Faraday’s Law and Generator dt d emf mag ! " = Two ways to produce curly electric field: 1. Changing B 2. Changing A ( ) A B dt d dt d mag ! = " dt dA B A dt dB ! ! + = Two Ways to Produce Changing Φ A bar magnet falls through a long aluminum tube. Consider a circular path around the tube above the falling magnet. What is the direction of dt B d ! ! ? 1) +y (up) 2) –y (down) 3) zero magnitude A bar magnet falls through a long aluminum tube. What is the direction of magnetic field at the location of the magnet, due to the current in the red loop? 1) +y (up) 2) –y (down) 3) zero magnitude Three kinds of electric and magnetic effects on electrons in a wire 1. Coulomb electric field due to surface charges1....
View
Full Document
 Winter '07
 k
 Force, Magnetic Field, motional emf, mag dt

Click to edit the document details