A battery is connected to wires that hand vertically (gravity acts down in the diagram). Hooks at the ends of the wires hold a horizontal copper bar (the thick bar) of mass 0.6 kg and length 0.5 meters. Another apparatus (not shown) can create a uniform magnetic field in the region of space given by the dashed rectangle. The total resistance of the circuit is 1.20 Ohms and the battery supplies 24 Volts. The magnetic field can be adjusted in strength until the bar lifts off of the hooks and levitates magnetically – not moving just above the hooks as shown.
a) Determine the necessary direction of the magnetic field in the dashed rectangle.
b) Calculate the required magnitude of the magnetic field.
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