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4. Connect a wire lead, a battery and a switch such that charge will flow from C to D, across the magnetic field of the horse-shoe magnet when the switch is closed (Figure 4). Make sure that the lead CD is free to move in a direction perpendicular to CD. First use the right hand rule to predict the direction in which the wire will move, and then actually close the switch and observe which way the wire moves. Figure 4 Prediction Actual