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 15' Field Coil Speaker US $500.00 
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 Midwest Tube Receiver, Copper Bezel, 200-300 Band Scale US $99.00
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 Jensen Field Coil Speaker F15ll US $495.00
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 Rola by Jensen Vintage Field Coil Theatre Speaker Western Electric licensed US $195.00
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If the wire carries a current of 1.6 A, what is the force on the wire?
A loudspeaker cone is moved by the force of a permanent magnet on the current in a coil of wire. The coil in a certain loudspeaker has 25 turns of wire and a total length of 1.50m . The magnet in the speaker applies a magnetic field of 0.14 T that is everywhere perpendicular to this coil of wire, as shown in the figure.
F = B I L
This applies to the geometry of the loudspeaker so
F = 0.14 * 1.6 * 1.50 = 0.336 N
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