Unformatted text preview: I , where the long side is in the plane de²ned by the B²eld and the normal and the short side is perpendicular to this plane. The currents of the rectangles all have the same sense as the current of the original loop. (“Sense” in mathematical jargon is direction when there are only two possibilities.) The rectangles tile the original loop with their short sides and end bits of long sides tracing the original loop as closely as possible. These rectangles are bound rigidly together by some unspeci²ed force. We only have to be concerned with torque component along the axis perpendicular to the magnetic ²eld and the normal to the loop: let us call this the pivot axis for brevity. All the other torque components cancel to zero though this isn’t so easy to see without a diagram. A diagram of the replacement loop would help....
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 Fall '06
 Buchler
 Physics, Current, Force, Magnetic Field, loop, τ, 1022 J, 3500 km

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