Show:
Magnets and Magnetism 1
Magnets and Magnetism 2
Magnetism from Electricity
Potpourri
Random Facts/Brain Teasers
100
Any material that attracts iron
What is a magnet
100
Magnetic poles are always in _____________
pairs
100
the study of the interaction between electricity and magnetism
What is electromagnetism
100
A device that increases or decreases the voltage of alternating current.
What is a transformer
100
Name the type of animal who ran for mayor in a small town, and won.

A donkey

200
What 3 properties do all magnets have?
1) They have a north pole and a south pole 2) They exert a force 3) They are surrounded by a magnetic field
200
In magnetic forces, like poles ______________ and opposite poles ______________
Like poles repel (push apart) and opposite poles attract (stick together)
200

What do you need to make an electromagnet?

What is a battery, metal, and wire

200
What causes an aurora or "northern lights"?
An aurora is formed when charged particles from the sun hit oxygen and nitrogen in the air.
200

What has holes all over it but still holds water?

A sponge

300
The region around a magnet where the magnetic force can act
What is a magnetic field
300
Tiny groups of charged atoms inside iron.
What are domains
300
A coil of wire wrapped around an iron core
What is an electromagnet
300
What do scientists think causes the Earth's magnetic field?
The movement of electric charges in the Earth's core.
300

What item gets wet as it drys?

What is a towel

400

What makes something magnetic?

The domains(electrons) in the object must be aligned or lined up.

400
What happens when you cut a magnet into 2 pieces? Why?
Each piece will have a north pole and south pole because the domains inside the magnet re-align.
400
What is an electric motor?
A device that changes electrical energy into mechanical energy.
400
What are 4 ways for a magnet to lose it's magnetism?
1) drop the magnet 2) putting the magnet in a strong magnetic field 3) Increasing the temperature 4) hitting the magnet all of them make the domains inside the magnet lose alignment.
400

How do 2 trains both pass through a single track tunnel at 7:00?

One came at 7:00 am and the other came in at 7:00 pm.

500
Name 2 kinds of magnets and what they are made of.
1) ferromagnets are made of iron, cobalt, nickel 2) electromagnets are made from a magnet and an electric current
500
Why does a compass needle point north?
Because the magnetic pole closest to the geographic north pole is the magnetic south pole.
500

What 2 ways can you increase the power of an electromagnet?

By increasing the number of loops of wire and increasing the current.

500
Explain the difference between a step-up and a step-down transformer.
A step-up transformer increases voltage and has more coils of wire in the secondary coil. A step-down transformer decreases voltage and has more coils on the primary coil.
500

What question is impossible to answer Yes to?

Are you asleep?