Logged out
Access All our Essays in an Instant
Swap your work for FREE access, or pay £4.99 for instant access
Find out the factors affecting the strength of an electromagnet.
Member rating: No Rating | Words: | Submitted: Thu Jul 11 2002
Page Preview
On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:
ELECTROMAGNETISM AIM: The aim of this investigation is to find out the factors affecting the strength of an electromagnet. BACKGROUND KNOWLEDGE (THEORY): Magnetism is the tendency a metal such as iron, steel and cobalt have to attract other metals e.g. pins. Magnetism arises as a result of the motion of charged particles called electrons in the wire. In most substances the effect of this motion cancel out, but in ferromagnetic substances they do not. When insulated wire is wrapped round an iron nail and the ends of the wire are connected to a battery, and the nail becomes capable of picking up iron filing or paper clip. The nail is magnetised by the current in the wire. If the battery is disconnected then the clips will fall of. This is because they are not a permanent magnet; they are called temporary magnetism. The iron filings cluster around the end of a magnet...
To see the full version of this document, and 145,348 others
