magnetism

Question 1

how is electromagnet formed

Answer 1

when an electrical current is passed through a coil wrapped around a magnetic material ,an electromagnet is formed

Question 2

what tipe of rock could atract iron

Answer 2

MAGNETITE

Question 3

what is magnetite named after

Answer 3

magnetite is named after a place called magnesia in Asia

Question 4

how many years ago did the chinese use rocks with magnetic properties to find direction

Answer 4

4 000 years ago

Question 5

how did the chinese indecate direction

Answer 5

they would use a small strip of magnetite . they placed this on a piece of wood floating in a bowl of water . the piece of magnetite would turn so that it pointed towards the strongest magnetic area (usually north) . this was usfull for sailors

Question 6

what is magnetism

Answer 6

magnetism is a physical property of matter. the magnetic property of matter produces a field of ATTRACTIVE FORCES and REPULSIVE FORCES. Magnetism is the force that causes a nail atract to a magnet

Question 7

what is a magnet

Answer 7

a magnet is a device that produces a field which is the area around a magnet in wich the forces of attraction and repulsion can be felt. some magnet are permanent magnets . this means that the magnet has magnetic properties all the time . a temporary magnet like an electromagnet has magnetic properties when an electric current passed through it

Question 8

Name 2 types of permanent magnets

Answer 8

• horseshoe

* bar magnet

Question 9

true or false

a magnet does not atract all substances

Answer 9

TRUE

Question 10

true or false

a substance atracted by a magnet is a magnticalsubstance

Answer 10

FALSE : a magnetic substance

Question 11

name a few basic magnetic substanceses

Answer 11

• iron
• nickel
• cobalt

Question 12

explain magnetic fields

Answer 12

it is a space around the magnet where a pulling force can be felt . the field run from the north pole to the south pole of the magnet .

Question 13

how do you take care of a magnet

Answer 13

1) do not drop or hit a magnet . magnets are brittle . a magnet could lose its magnetic properties if it is dropped or hit .
2) do not place a magnet near fire
3) do not store magnets with the same pole facing each other. Store magnets with the north pole of one magnet facing the south pole of another magnet
4) when you store a horseshoe magnet place a keeper plate on the end of the magnet to protect the poles