Right, but you're not trying to do so over whole room, are you? The field from a solenoid falls off as r-3, while that from a current line falls off as r-1, so, if you want to paint a whole room with magnetic field lines, you'll probably need less current with the lines — on the other hand, you're running that current through a greater length of circuit, requiring more wire and more energy. Hmmm...
As mentioned elsewhere in these comments, I think some kind of board game is much more plausible. As for field disorienteering, I can imagine that, somewhere in the world, there was a bed of magnetite which, after having crystallized in alignment with the Earth's magnetic field at the time, was broken up by glaciers and deposited in the form of randomly oriented magnetic boulders scattered across a wooded area. Or not. But that's where you'd go to practice disorienteering.
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branchandroot
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Date: 2007-03-14 08:02 pm (UTC)As mentioned elsewhere in these comments, I think some kind of board game is much more plausible. As for field disorienteering, I can imagine that, somewhere in the world, there was a bed of magnetite which, after having crystallized in alignment with the Earth's magnetic field at the time, was broken up by glaciers and deposited in the form of randomly oriented magnetic boulders scattered across a wooded area. Or not. But that's where you'd go to practice disorienteering.