PRESENTATION OUTLINE
Materials
D battery
Insulated wire
Electrical tape
Compass
Box
Electical tape
Procedure
Cut a 1 meter loop of insulated wire.
Use electrical tape to secure a stripped end of the wire to one side of a D battery.
Run the wire up one side of the box, across the top, and down the other side. Make sure you have enough wire so that it can run along the table or ground to reconnect the battery. Now you have a loop!
Connect the other open end of the wire to the battery so current begins to flow.
Bring the compass into the center of the loop. What happens?
Move the compass around closer to the wire and away from the wire. Record your observations.
Results
The wire will carry a current that creates a magnetic field around itself. Bringing the compass near the wire or in the loop will cause the compass needle to move.
Why?
The current will induce a magnetic field based on the right-hand rule. Make a “thumbs-up” sign with your right hand. The thumb will be the direction of the current (flowing from the negative to positive terminal of the battery) and the fingers will curve around in the direction of the magnetic field.
The magnetic field created by the current will interfere with the magnetic field the compass experiences when it is brought near enough.
