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Science Checkpoint 8 I Chapter 9: Magnetism

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Chapter 9: Magnetism

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Science Checkpoint 8 I Chapter 9: Magnetism
 

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Science Checkpoint 8 I Chapter 9: MagnetismOnline version

Chapter 9: Magnetism

by Tharwat A
1

field attract poles area magnetic poles strongest

A magnet is something that will magnetic materials .

It consists of two , N and S , which is North and South respectively .

The magnet has a that will attract the paperclips when it reaches the .

The magnetic field is at the .

2

compass detected moves objects magnetic

A magnetic field can be by either observing whether a because of the attraction
OR use a .

3

direction magnetised turn

A compass contains a needle that is free to . The needle will turn and point in the of a magnetic field .

4

spins natural axis geographic imaginary magnetic

The north and south poles are the parts of the Earth through which the spin passes . The axis is the line around which the Earth .

The earth ? s field causes the appearance of lights visible in the night sky close to the north and south poles . These are caused by particles coming from the sun arriving into the stronger parts of the earth ? s magnetic fields .

5

move away repel

When a south and a north are pointing each other , there will be a force of attraction between the magnets .
When like poles are together the magnetic fields will or try to from each other .

6

lodestone needle north

A rock called contained magnetite was found 4000 years ago . The small of the lodestone will always point to the when floating on water .

7

Steel magnetise magnetised electricity turned iron magnet permanent electromagnet

Properties of magnetic materials .
- Magnetic materials include the metals , nickel and cobalt . is another common magnetic metal .
- They can be , that means be into a .
- The magnets we are using are called magnets because they have a magnetic field that is always there .
- one way to a magnetic material is by using . When this method is used , the magnet is called an .

8

compass cell bar two magnet reverse opposite two magnetic

Poles of an electromagnet
- An electromagnet has poles , similar to a bar magnet . T find out which pole is which in simple ways .

Use a . A magnetic compass points along the magnetic field lines , so will point towards the south pole .

OR

Use a with known poles , opposite poles will attract and like poles will repel .

WHEN making electromagnets . WE can the poles of an electromagnet in one of two ways .
- Wrap the coil around in the direction
- Reverse the connection on the .

9

greater stronger coil core current factors

Strength of electromagnets
The that affect the strength of an electromagnets are the components that made up of an ELECTROMAGNET
- A of wire ( the more turns , the stronger )
- a magnetic inside the coil and ( Materials of the core . Iron and some types of steel make the strongest electromagnets )
- an electric flowing in the coil ( The the current , the the electromagnet )

10

down produce images bell toaster electric make pushed handle MRI move hammer the

Applications of electromagnets

- Some types of scanner in hospitals use powerful electromagnets . AN scanner is used to from inside the human body .

- In a , when the is , an electromagnet holds down a metal basket with bread in it , A timer turns the electromagnet off and the metal basket pops up with toast .

- An uses an electromagnet to . When the electromagnet is on , the hammer is pulled onto the bell . The movement breaks the circuit and the hammer moves away from the bell . The circuit becomes complete again and the hammer is pulled back to the bell . This continues until the power supply is turned off .

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