Ask the students what they think will happen when you turn on the switch and the current begins to flow. Open and close the circuit several times so the students can observe the compass. To print out the Student Copy only, click here . Do not place electromagnets near computer disks, VCR, audiotapes, televisions, or computer monitors. If the wire or battery becomes hot, disconnect the wire.
Procedure Do in groups of two to three students.
Students should use the equipment at their station to make an electromagnet. Make an electromagnet by wrapping the magnetic nail with the wire very tightly towards the end of nail you wish to use as your magnet. Remember that you need to keep the stripped ends of the wire out of the coils and make sure you have room to connect the stripped ends to the battery and switch so start the wrapping with the center of the wire. Have the students start with only a few winds such as 5. Have students turn the electromagnet on by closing the switch.