lecture 15

lecture 15 - Since I'm moving the conductor which contains...

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Since I’m moving the conductor which contains charges, I’m moving the charges in a magnetic field. Thus they feel a force! The phenomenon of producing induced emf’s with a changing magnetic field is called Electromagnetic Induction. 22.2 Motional emf What happens if we move a conducting rod at right angles to a uniform magnetic field? xxxxxxxxxxxxx B When the rod moves, the electrons in the rod feel a force, since they are charges x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x moving in a magnetic field: θ sin qvB F = + By RHR-1, the electrons move to the bottom of the x x x x x x x x x x x x x x x x x x x x x x x x x x x x L - rod, and positive charges move to the top. Thus, the rod acts as a source of emf, like a battery. The induced emf is called a motional emf. x x x x x x x x x x x x x x (motion of charges through a mag. Field)
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An electric field is setup within the rod, and the separation of charges along the rod continues until the attractive electrical force between the charges equals the magnetic force. gq g x x x x x x x x x x x x x x xxxxxxxxxxxxx + B M E F F = Once no further charge eparation takes place. M E F F = x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x v L separation takes place. The motional emf is maintained as long as the bar keeps moving.
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lecture 15 - Since I'm moving the conductor which contains...

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