A single loop of wire carrying current I2 is placed near the end of a solenoid having N turns and carrying current I1, as shown in Figure P18.2. The solenoid is fastened to a horizontal surface, but the single coil is free to move. With the currents directed as shown, is there a resultant force on the single coil? If so, in what direction? Why?
Analysis:
Yes, the resultant force on the single coil is in the downward direction. If the coils are thought of as electromagnets, there is a north pole from the lower coil attracting a south pole from the upper coil.
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