emf - V = l v B ⊥ V is the voltage(in volts l is the...

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Note-A-Rific: EMF The term “electromotive force” is still commonly used to describe the voltage measured in a conductor (like a wire, or a piece of metal) as it moves perpendicularly through a magnetic field. It is not really a force. Electromotive force (EMF) is measured in volts o It’s exactly the same as when we calculated voltage, A.K.A. potential difference. As a piece of wire moves through a magnetic field, a force acts on the charges in the wire. Because the charges are moved to where they would not normally accumulate, a potential difference (voltage) builds up. If the wire is moving perpendicular to the magnetic field and perpendicular to its own length, a voltage will occur given by…
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Unformatted text preview: V = l v B ⊥ V is the voltage (in volts) l is the length of wire in the magnetic field (in metres) v is the velocity of the wire moving through the field (in m/s) B ⊥ is the strength of the magnetic field (in teslas) Example: An airplane is flying at 1000km/h through an area where earth’s magnetic field is 5.0 x 10-5 T and nearly vertical. What is the potential difference induced between the wing tips which are 70m apart? Remember to change the velocity into metres per second before doing any calculations… v = 1000 km/h = 280m/s V = l v B ⊥ V = (70m)(280m/s)( 5.0 x 10-5 T) = 1.0V Which isn’t much, but it must be taken into account when designing the plane....
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This note was uploaded on 02/29/2012 for the course PHYS 227 taught by Professor Rabe during the Fall '08 term at Rutgers.

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