Purpose: To demonstrate the magnetic field lines that surround a current carrying conductor and a solenoid.

Magnet arranged to produce a vertical field, rectangular loop suspended by one side so that the opposite side can move in the field, DC power supply, DPDT switch.

Set up the circuit so the current flows one way through the wire when switched one way and so the current will flow the opposite direction if switched the other way. Turn on the power supply and throw the switch in one direction. Reverse the switch, which reverses the current through the loop. Observe the direction of motion of the wire in each case.

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