Electricity and Magnetism

Question 1

What elements are able to be easily magnetized and attracted to a magnet?

Answer 1

Iron, nickel, Colbalt

Question 2

What are magnetic domains, and what happens to them when a magnet is demagnetized?

Answer 2

Domains are group of atoms whose magnetic fields are aligned. When it is demagnetized, the fields will point in different directions

Question 3

Describe the magnetic field lines around a bar magnet and the reletive strength and direction of the magnetic force at various places in the field

Answer 3

Magnetic fields around a bar magnet have the following properties

1. The poles will always exert a force. From North, and South, a straight line will appear
2. The magnetic field connects the North and South poles
3. The closer the field lines, the stronger they are
4. Near the poles, the strength will the at its highest

Question 4

Describe the Behavior of magnetic poles

Answer 4

Unlike: Attract

Like: Repel

Question 5

What happens to electrically charged particles in a magnetic field

Answer 5

In a magnetic field, the subatomic particles are always moving (electron spin, protons etc) However, the atoms, usually cancel out and leave the atom neutral. In a magnetic field, with a current, it is usually moving. If there is no current, but just a wire, then the magnetic field has to be able to move in order for the electrically charged particles to move

Question 6

When an electric cureent flows through a conductor, it will create a magnetic field in what direction?

Answer 6

You have to use the right hand rule for this. To use the right hand rule, do the following.

1. Hold the pencil the way that the current is flowing
2. Then, where your fingers are curling is the direction of the magnetic field
3. Where your knuckles are pointing is the (NSWE) direction of the magnetic field

Question 7

What is an electromagnet, and how is it built?

Answer 7

An electomagnet is essentially a wire, that is wrapped into coils with a magnetic bar (iron, nickel, colbalt) inserted through the middle.

Some ways to increase the strength is to insert a stronger magnet, increase the current, or tighten the coils

Question 8

What is the difference between an electromagnet and a permanent magnet

Answer 8

An electromagnet will stop once the current is switched offf. However, a permanent magnet retains its properties through whatever.

Question 9

What is the Basic Explaination of An Electric Motor

Answer 9

There are 4 electromagnets.

1. The electromagnets are in the same direction,(NS)