Unformatted text preview: multiple moving charges, or currents. Magnetic Force on a Current Though it was simplest to define the magnetic field in terms of the force on a single moving charge, it is nmore common to encounter a currentcarrying wire in the presence of the magnetic field. To find the force on such a wire we simply need to remember the equation for current: I = , or that the current is the amount of charge passing through a given point in a period of time. We may thus substitute It for q in our equation, our force equation: F = = = where L is the length of wire with the current running through it. Many times, however, the wire will be very long and we'll want to know the force per unit length. To do so we simply divide both sides of the equation by L : = From this equation we will be able to see many properties of magnetic field...
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This note was uploaded on 02/09/2012 for the course PHY PHY2053 taught by Professor Davidjudd during the Fall '10 term at Broward College.
 Fall '10
 DavidJudd
 Physics, Charge, Force

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