A u-shaped bar is resting in two cups of mercury through which a current can pas

Question

A u-shaped bar is resting in two cups of mercury through which a current can pass. It is oriented at right angles to a uniform magnetic of 0.5 T. Our goal here is to find the current required and its direction, (left or right) in order to lift the bar against its own weight. The bar has a mass of 120 grams and a length in the field of 15 cm. You will need to sketch the situation, include all directions of field, forces and current direction and calculate the current to lift the bar. Let the magnetic field into the page.

Explanation / Answer

assume direction of field is into the plane. then by right hand thumb rule current flows from left to right

current*length*B = mg

current = .12*9.8/(.5*.15) = 15.68 A

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