Hi everyone, i am going to tell u how to make a small, simple and strong electromagnet. Sorry about the bad quality pics and videos and i could not upload many pics step by step, but i will try to explain as much as i can. U can see the videos in the last step.
Step 1: The Items You Will Need
The items you will need are:-
1. 20 gauge enamel coated copper wire also known as magnet wire. ( I bought around 20 meters)
2. a spool like the one i use or something similar.
3. electrical tape.
4. 6v battery (better if using 800-850 ma) i used a 1.5A.
5. A ac to dc converter.
6. aligator clips.
7. a neodymium magnet.
And a lot of time.
Step 2: Step 3
This is the most toughest, boring and time taking step of all. All u need to do is take the 20 gauge copper wire and coil it around the spool until u get 6-7 layers. You have to coil them close and tight, and have to put some electrical tape after each layer.
Step 3: Step 4
Now once u have finished coiling the wire u can heat the tip of the wire until it gets red hot or red and then take a wet steel wool and scrap of the enamel coating off the wire. then u should be able to see bright copper.
Okay, ur electromagnet is ready, now to test it take a converter of 800-850 ma(i used 500 ma which is really weak.) and connect the pins using the alligator clips and then set the converter on 9v and above and u can test it by dropping a magnet inside it and it will stay in the middle and if ur using a 800 or 850 ma converter try keeping a iron or steel nail at the bottom of the elctromagnet and release it and it should get sucked into the middle this is called solenoid effect and u can study more about it here http://en.wikipedia.org/wiki/Aharonov%E2%80%93Bohm_effect. If ur not using an 850ma converter just use an 6v 1.5A or an 6v1A battery and test the experiments given above, but be aware that if u are using a 6v 1.5A battery the electromagnet gets really hot to handle.
Step 5: Step 5
Great ur electromagnet is done, now if u need to know the north and south pole of a electromagnet all u have to do is curl ur fingers and then point ur thumb in the direction of the + wire and that will be ur north pole for example if i have connected the battery + to the wire at the top of the coil then that will be the north pole and the other one will be the south pole. Thanks for reading the instructable and i hope it was helpful and informative.These are the video links http://www.youtube.com/watch?v=P6weW6AlU94 http://www.youtube.com/watch?v=P6weW6AlU94 http://www.youtube.com/watch?v=Qp-Xe6swmQQ