Monday, January 25, 2016

Electromagnets

Electromagnets

Pre Activity: In the pre activity we saw that the needle (magnet) in the compass always aligned with the battery. The North part of the magnet with the negative side of the battery and the other way around. I think this happens because the battery is electromagnetic which means that it has a magnetic field.

Activity: When we first got the wire to make the electromagnet stronger I thought that I only had to connect the circuit and make the magnetic field be stronger. But obviously this didn't work so we gave the wire 16 loops around the medium sized nail but it's magnetic force still wasn't. After that we tried to change the nail to a bigger one and we changed the wire to one that looked more like copper, and looped it 15 times around the nail but this time the force was even less because it didn't attract the compases needle. Finally we went back to the original wire and but kept the big nail so we could wrap it a lot more times. So we wrapped the wire it 36 times around the nail and the magnetic force grew a lot, so when we tried to pick up a paper clip using that magnetic force we ended up picking up 3 paper clips at the same time. But then we dropped the nail and after that we could only pick up one paper clip. The drop made it loose some magnetism. 

Some factors that influence the strength of the electro magnet are how many times the wire is looped around the nail and which wire you use. The more loops you give the wire the more magnetic force it will have.

No comments:

Post a Comment