GS 8 Magnetic Force, GS 9 Electromagnetism

magnetic field force

the force that acts between magnetized objects

attract

opposite sides of a magnet will

repel

same sides of a magnet will

iron, nickel, cobalt

examples of magnetic materials

permanent magnets

objects that keep their magnetic properties for a long time

temporary magnets

magnet that loses its magnetism after a short time

increase magnetic force

how will increasing mass affect magnetic force?

decrease magnetic force

how will moving two magnets farther apart affect magnetic force?

magnetic fields

a region around a magnetic material where other objects can be attracted or repelled

north to south

magnetic field lines always go from the ________ to _______ pole

curve away from the other magnet

magnetic field lines from two of the same poles will

go towards the other magnet

magnetic field lines from two opposite poles will

longer arrows

a force diagram that shows a strong force between two objects will have

shorter arrows

a force diagram that shows a weak force between two objects will have

mass and distance

two factors that affect magnetic force

horseshoe magnet

a type of magnet that has a bend in the middle

bar magnet

a magnet in the form of a bar with magnetic poles at each end

magnet

any material that attracts iron and materials that contain iron

magnetic domains

A group of atoms whose magnetic fields are aligned

two poles

if you cut a magnet in half, will the new magnet have two poles or just one?

the field lines will go towards the other magnet

how will the field lines of two magnets look if they are attracted to each other?

the field lines will bend away from the other magnet

how will the field lines of two magnets look if they are repelling each other?

electromagnet

a coil that has a soft iron core and that acts as a magnet when an electric current is in the coil

solenoid

a coil of wire with an electric current in it

open circuit

an incomplete electrical circuit in which no current flows

closed circuit

a complete circuit through which electricity flows

negative to positive

direction electrons flow in an electric circuit

electrons

Negatively charged particles

generator

a device that produces electricity by moving a magnet relative to a nearby coil of wire

motor

a device that uses an electromagnet to turn electric energy into mechanical energy or motion

coil

made of wire and wraps (in this case around a ferromagnetic material creating a solenoid)

electromagnetism

the relationship between electricity and magnetism

add coils and increase electric voltage

ways to increase electromagnet strength

field can be turned on or off, field can have direction reversed, field can have its strength changed

characteristics of a magnetic field produced by an electrical current

magnetic field

in an electromagnet, an electric current can produce a

electric current

in a motor or generator, a magnetic field can also create an

outer core

the churning liquid iron in the _______ _________ of the earth surrounding the solid iron inner core is like the coil of wire wrapped around the nail of an electromagnet

inner core

the solid iron _______ ________ of Earth is like the iron nail in an electromagnet

Earth's magnetic field

the moving liquid iron in earth's outer core creates electric currents that generates