Identification of the magnetic poles of a solenoid
Materials
An insulated copper wire
A magnetic compass
A 9V battery
A battery connector
Method
Wrap the insulated copper wire around a cylindrical object such as a fine pipe or a marker pen, making several loops.
Pull out the cylindrical object to form a spring-shaped coil.
Remove the layer of insulation at both ends of the wire by scratching it with a knife or by heating it in a burning candle.
Place a magnetic compass on one side of the coil.
Connect the two ends of the coil to the battery using the battery connector.
When electric current flows in the coil, observe which pole of the compass needle is attracted by the coil, and fill in the table.
Swap the poles of the battery connected to the coil. Observe which pole of the compass needle is attracted this time, and fill in the table.
Before changing the poles of the battery: when the magnetic compass is placed on the right-hand side of the coil, the attracted magnetic pole
Before changing the poles of the battery: by placing the magnetic compass on the left-hand side of the coil
After changing the poles of the battery: when the magnetic compass is placed on the right-hand side of the coil, the attracted magnetic pole
After changing the poles of the battery: by placing the magnetic compass on the left-hand side of the coil
........ pole
........ pole
........ pole
........ pole
Discussion
Result before changing the poles of the battery: since the ........ pole is attracted when the magnetic compass is on the right-hand side, the just opposite pole, that is the ........ pole, must have been created in the coil.
Result after changing the poles of the battery: ........
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