Lecture_14

# Lecture_14 - An electric field is setup within the rod and...

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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. 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 - E If v = 0, then F M = qvB sin θ = 0 and F E will reunite the + and charges, thus eliminating the emf. What is the magnitude of the emf? vBL = ε ε is the induced emf (voltage) v is the speed of the bar the magnetic field This is true when v , B , and L re mutually perpendicular B is the magnetic field L is the length of the bar in the field are mutually perpendicular.

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22.2 (cont.) Motional emf So a motional emf occurs when a conductor is moved through a magnetic field. Let’s form a complete circuit with the conducting rod, so that a current can flow. Light bulb hen we slide the bar to the right xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxxxxxxxxxxxxxx B
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Lecture_14 - An electric field is setup within the rod and...

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