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1 Magnets and Pivot Forces on Magnets

One magnet is centered on a pivot. Hold one end of the second magnet near one end of the magnet on the pivot. Repeat with the opposite end.

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2 Cathode Ray Tube Force on Moving Charges

Plug in the cathode ray tube. Deflect the beam of the CRT by holding a permanent magnet near the edge of the tube. If the beam disappears, you are holding the magnet too close.

OR, deflect the beam by attaching a battery to the binding posts and adjusting the variable control knob.

OR connect the battery directly to the deflection plate terminals.

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3 Parallel Wires Forces on Current in Wires

Two insulated wires hang from a frame. Turn on the switch. Wires will attract or repel each other. Turn off the switch and reverse the leads in the binding posts. Turn the switch on. Wires will repel or attract each other.

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4 Interacting Coils Forces on Current in Wires

Hang two coils from a support rod. Connect the DC power supply so that the current is in the same direction in both coils and watch them attract. Connect the DC power supply in opposite directions in the coils and watch them repel. A good storage battery can be used instead of the power supply.

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5 Jumping Wire Forces on Current in Wires

A long wire is coiled around one pole of a permanent magnet. Close the switch. The wire collapses into the magnet. Turn the coil over and repeat. The wire "jumps" out of the magnet.

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6 Model Galvanometer Torques on Coils

A crude galvanometer with a large coil and magnet demonstrates the essentials.

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