Download Chapter 17- Section 1 Magnets and Magnetic Fields

Chapter 17- Section 1 Magnets and Magnetic Fields
Magnets
- Some materials can be made into ________________ magnets.
o Although a magnetized piece of iron is called a “permanent” magnet, its magnetism can be
_________________or even __________________.
o _______________ is a soft magnetic material.
 It is ______________ magnetized.
 It tends to ____________its magnetic properties easily.
o _______________ is a hard magnetic material.
 It is more _________________ to magnetize.
 Once _____________________, it doesn’t lose its magnetism easily.
- Magnets exert ___________________________ on each other.
- Like poles ______________, and opposite poles _____________________.
o A ____________________ is one of two points, such as the ___________of a magnet, that
have _________________ magnetic qualities.
o Magnets have a _________ of poles, a ___________ pole and a ______________ pole.
o It is impossible to isolate a ____________ magnetic pole from a __________ magnetic pole.
Magnetic Fields
- __________ are sources of magnetic fields.
o Magnetic force is a ___________ force.
o When magnets ________ or __________each other, it is due to the interaction of their _____.
o A ______________ is a region where a magnetic force can be detected.
 Magnetic field lines are used to represent a _________________________.
 The magnetic field gets weaker with _______________ from the magnet.
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___________ can track magnetic fields.
o A compass is a __________
suspended on top of a pivot so
that the magnet can rotate
freely.
o A compass aligns with _______
magnetic field.
Earth’s magnetic field is like that of a ________ magnet.
o Earth’s magnetic field has changed ____________throughout ____________ time.
Earth’s magnetic poles are _______ the same as its ______________ poles.
Chapter 17- section 2 Magnetism from Electric Currents
Magnetism from Electric Currents
- Hans Christian ______________ found that magnetism is produced by __________ electric charges.
- Electric _________produce magnetic fields.
- The magnetic field of a ______________________ resembles that of a bar magnet.
- A _________________ is a coil of wire with an electric _______________ in it.
o In a _______________, the magnetic field of each loop of wire adds to the _____________ of
the magnetic field of the loop next to it.
o More _______or more ________ can create a stronger magnetic field.
- An electromagnet is a ______that has a soft _______ core and that acts as a ________ when an
electric __________ is in the coil.
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Magnetism can be caused by _______________________.
o Negatively charged __________ moving around the nuclei of all atoms make magnetic fields.
o Atomic nuclei also have magnetic fields because _____________ move within the nucleus.
o Each electron has a property called ____________, which also produces a tiny magnetic field.
Magnetic atoms rotate to __________ with the magnetic fields of nearby atoms creating small
regions within the material called ____________.
Electromagnetic Devices
- Galvanometers detect _______________.
o A __________________ is an instrument that ___________, ____________, and determines
the ________________ of small electric current.
- Electric motors convert _____________ energy to ________________ energy.
Chapter 17- section 3 Electric Currents from Magnetism
Electromagnetic Induction and Faraday’s Law
- ____________________________________ is the process of creating a current in a circuit by
__________________ a magnetic field.
- _______________ law states the following:
_______________________________________________________________________.
o As the __________ moves in and out of the magnetic field of the magnet, a current is
_________ in the ______________.
o ________________ the circuit or changing the _______________ of the magnetic field will
also induce a ______________ in the circuit.
- A _______________ is a machine that converts _____________ energy to ______________ energy.
- An _________________ current is an electric current that changes ___________ at regular intervals.
o For each half __________ of the loop in an AC ___________, the current produced by the
generator ________________ direction.
- __________________ produce the electrical energy you use in your home.
Transformers
- A ____________ is a device that increases or decreases the _____________ of alternating ________.
o Transformers can ____________ or _____________ voltage.
 The voltage induced in the ________________ coil of a transformer depends on the
______________of loops, or turns, in the ____________.
o In a ______________ transformer the voltage across the secondary coil is _____________
than the voltage across the primary coil.
o In a _________________ transformer, the secondary coil has __________ loops than the
primary coil and the voltage is ____________ by the transformer.
That’s All Folks!!