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Magnetism – Notes
Magnetism

A force of ____________________ and ____________________

Magnets have three main properties
1. Magnets _____________________ and materials that contain iron.
2. Magnets attract or repel other __________________
3. One end of a magnet always points _________________ when allowed to swing
freely
Magnetic Poles

Each end of a magnet is called a ______________________________

Magnetic poles that are alike __________________ each other

Magnetic poles that are unlike __________________ each other

The magnetic effect is _______________________ at the poles
Magnetic Force
o The _______________ or repulsion between ______________________

Magnetic Force is produced when magnetic poles ___________________ each other
and __________________.

Any material that exerts a magnetic force is a ______________________
Magnetic Fields

The area of magnetic force around a magnet is known as it’s
_____________________________

Magnetic field lines map out the __________________ magnetic field around a magnet.
-
Spread out from _____________.
-
____________ around the magnet.
-
Return to the other pole

Lines form complete _____________ and never cross

Always leave the ___________________ and enter the ____________________

The _______________ the lines are the ____________________ the field.
Single Magnetic Field

Although you cannot see a magnetic field, you can see its effects.
o The _______________ forces of the magnet act on the ____________________
and align them along the invisible magnetic ___________________________
Combined Magnetic Field

The magnetic field of two or more magnets overlaps
o The effects of magnetic force on iron fillings when the poles of two magnets are
brought near each other.
o The fields from _______________ poles _________________ each other
forming a ________________________ between the magnets.
o The fields from two ______________ poles ____________ each other.
Compass

A compass is a device that has a ________________ on a needle that spins freely; it is
used for ______________________ because it’s needle usually points _____________
Earth’s Magnetic Field

The motion of Earth’s _________________________________ creates a
_________________________ similar to a bar magnet’s magnetic field.
Electric Charge

The interaction between electric charges is called _____________________

An ________________________ is a region around a charged object when the object’s
electric force is exerted on other charged objects.

When electric charges are made to flow through a material, they produce and
_______________________

An electric motor is a device that uses an electric current to turn an axle.
o An _________________________ transforms electrical energy into mechanical
energy.
Electromagnetic Force

___________________________ - the relationship between electricity and magnetism

An ______________________ produces a _______________________

The magnetic field produced by a current has ______________ and _______________

The field can be turned on or off
o By turning the ________________________ on or off

The field can have its direction reversed
o By reversing the __________________ of the current

The field can have it’s strength changed
o By _____________________ the amount of current or by making a
_______________________ in the wire.
Solenoids and Electromagnets

Use ______________________ and ______________________ to produce
_________________ magnetic fields

A coil of wire with a current is called a solenoid.
o The two ends of a solenoid act like the poles of a magnet, but the north and
south pole ___________________ when the ___________________ of the
______________________ changes.

A solenoid with a ferromagnetic core is called an ___________________________
o Magnetic field of an electromagnet is ____________________________ than
the magnetic field of a solenoid.
o There are four ways to make an electromagnet stronger
1. ________________________________________
2. ________________________________________
3. ________________________________________
4. ________________________________________