Electromagnets!

Electromagnets!

Magnet facts

• A magnet has two ends called poles, North and South.

• Different poles attract (N sticks to S)

• The same poles repel each other (push each other away)

• Invisible field line connect the north to the south

Multiple Choice

What will happen when these magnets are brought close together? (image shows two magnets with the N end pointed towards each other)

• They will attract each other.

• They will repel each other.

• Both the magnets will turn to the left.

• Both the magnets will turn to the right.

Multiple Choice

Looking at the drawing. If you tried to move these 2 magnets closer together, what would you feel? (image shows two magnets with the N end pointed towards a S end)

• Push Away

• Pull Closer together

• No Force

• Let the Force be with YOU

Magnet facts

• 4 common types of metal are magnetic, (Iron, steel, cobalt and nickel)

• The rare earth elements samarium, dysprosium and neodymium are also magnetic

• The strong neodymium magnets are a mix of neodymium, iron and boron

Multiple Choice

The force of magnetism is stronger when magnets are ________________

• cold
• round
• closer together
• farther apart

Multiple Choice

Earth acts like a giant magnet because its center is made up MOSTLY of

• Granite

• Limestone

• Iron

• Nickel

Multiple Choice

Magnets are _____ to objects that contain Iron, Nickel, Cobalt or Steel

• Attracted
• Repelled

What makes a magnet magnetic?

• Inside magnetic materials are "domains"

• Each domain has its own North and South pole

• When all the domains line up in the same direction a stronger magnetic field is made

What is a domain?

• The spinning of electrons around an atom's nucleus creates a magnetic field

• In some materials like iron the atoms can get lined up so that their atoms generate a magnetic field in the same direction

• Each section of atoms spinning the same direction is a domain

Multiple Choice

Would this substance be magnetized? (picture shows magnetic domains lined up in the same direction)

• Yes because they all point to the left

• Yes because they all point in the same direction

• No because they all point in the same direction

• No because magnets always point East not West

Multiple Choice

Magnetism is generated by moving

• protons.

• electrons.

• neutrons.

• elements.

Electricity

Electricity is the energy of moving electrons

Electromagnetism

An electrical current moving through a wire creates a magnetic field

Multiple Choice

Electric currents produce _____________

• electron clouds

• magnetic fields

• sound waves

Why do it?

Electromagnets are useful because they can easily be turned on and off and they can be made stronger or weaker as needed

Electromagnets are used in many different ways

• Cranes

• Levitating trains

• Electronic locks

• MRI machines

Multiple Choice

What type of magnet that can turned on and off?

• electromagnet

• permanent magnet

• electricity

• battery

Multiple Choice

Magnets on refrigerator cannot be turned off. Which type of magnets they belong?

• electromagnets

• battery

• permanent magnets

• copper wire

Multiple Choice

Why doe the compass needle move when the electricity flows through the coiled wire?

• Because a magnetic field is not produced, which do not attract to the needle.

• Because a magnetic field is produced, which attracts the compass needle.

• Because the battery produced magnetic field.

To make a simple electromagnet - try this at home

• Wrap wire around a nail

• Connect the wire to each end of a battery

• Test: Different size batteries, different kinds of wire, longer or shorter wires

Multiple Choice

Moving electrical charge or current creates a

• dead zone for magnets

• magnetic field

Multiple Choice

More coils of wire gives you a

• weaker magnetic field

• stronger magnetic field

• Doesn't change the field

Multiple Choice

A bigger battery gives you a

• weaker magnetic field

• stronger magnetic field

• Doesn't change the field

Open Ended

What is another variable or part of the electromagnet you could try changing to change the strength of the magnet?

Open Ended

What questions do you still have about magnets or electromagnets?