Lesson 1
the property of attracting another object to a magnet
What is magnetism?
In the late 1500's, Sir William Gilbert deduced this about the Earth.
What is the fact that the Earth acts like a giant magnet with magnetic fields surrounding it?
Materials in which electric current can run freely.
What are conductors?
a magnet that can be turned on and off
What is an electromagnet?
This is caused by protons and electrons interacting with Earth's atmosphere.
What is an aurora?
When two unlike poles come near each other they ________________.
What is attract?
It is the angle between two lines, the geographical north pole and the magnetic north pole.
What is magnetic declination?
Materials in which charges are not able to move freely.
What are insulators?
This current-carrying coil creates a concentrated magnetic field that can be turned on an off.
What is a solenoid?
a stream of electrically charged particles traveling from the sun at high speeds
What is solar wind?
True or False: When you break a magnet in two, you will have a north pole in one of your hands and a south pole in the other.
False; you will have two different magnets, each with their own north and south pole.
These are two doughnut-shaped regions above Earth's surface. They contain electrons and protons that travel at high speeds.
What are the Van Allen belts?
Electric currents only flow through these.
What are electric circuits?
To make a solenoid more powerful, this type of object must be inserted in the coil.
What is a ferromagnetic object?
Name two examples of insulators and two examples of conductors.
Conductors: silver, gold, copper, steel, and seawater
Insulators: rubber, glass, oil, diamond, and dry wood
True or False: In a magnetized material most or all of the domains are aligned in the same direction.
True
True or False: Earth can make magnets.
What is true?
A device that prevents electric currents from completing a circuit.
What is a switch?
Name a use for an electromagnet.
What is moving scrap metal at a junkyard?
a material that shows strong magnetic effects
What is a ferromagnetic material?
the area of magnetic force around a magnet
What is the magnetic field?
This shapes the magnetosphere.
What is solar wind?
A compass adjusts its needle near electricity for this reason.
What is the fact that an electric current has a magnetic field?
Name two out of the four ways you can increase the strength of an electromagnet.
1. You can use a stronger ferromagnetic material for the core.
2. The current in the solenoid can be increased.
3. You can wind the coils of the solenoids closer to each other.
4. More loops of wire can be added to the solenoid.
the magnetic field of Earth as shaped by the solar wind
What is the magnetosphere?