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Math Help - how much current flows through bar.

  1. #1
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    how much current flows through bar.

    The two conducting rails in the drawing are tilted upwards so they make an angle of 30.0 with respect to the ground. The vertical magnetic field has a magnitude of 0.053 T. The 0.18 kg aluminum rod (length = 1.6 m) slides without friction down the rails at a constant velocity.

    How much current flows through the bar?
    A?

    heres a similiar formula, couldn't I manipulate that formula to solve for A?
    http://img340.imageshack.us/img340/383/22481052tg6.png
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  2. #2
    Forum Admin topsquark's Avatar
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    What diagram??

    You are aware, aren't you, that the formula F = ILB \cdot sin(\theta) represents the force on a wire that is carrying a current in a magnetic field?

    So if the bar is moving down the incline at a constant speed v, what force must the magnetic field be inducing to prevent the bar from accelerating (as it should do if there were no magnetic force acting on it)?

    -Dan
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