Magnetic field Domain Pole solenoid A Magnetic field The marked end of a compass needle always points directly to A earths geographic south pole B earths geographic
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Slide1
Magnets Review
Slide2The region around a magnet in which magnetic forces can act is called the
Magnetic field
Domain
Pole
solenoid
Slide3A)
Magnetic field
Slide4The marked end of a compass needle always points directly to
A) earth’s geographic south pole
B) earth’s geographic north pole
C) magnet’s south pole
D)
magnet’s north pole
Slide5B) earth’s geographic north pole
Slide6What do you end up with if you cut a magnet in half?
One north-pole piece and one south-pole piece
two unmagnetized pieces
Two pieces, each with north and south pole
Two north pole pieces
Slide7C) Two pieces, each with north and south pole
Slide8Earth’s magnetic field
Is produced by a giant magnet at the center of the Earth
Is produced by movement of electric charges in Earth’s core
Does not change over time
Bends outward at the magnetic poles
Slide9b)Is produced by movement of electric charges in Earth’s core
Slide10Which of the following is NOT true about an electromagnet?
It can be strong enough to levitate a train
The current may be turned on or off
Its strength is reduced by adding more loops
It consists of an iron core and current-carrying wire
Slide11c)Its strength is reduced by adding more loops
Slide12Any material that attracts iron or materials containing iron is called
Solenoid
Magnet
Superconductor
semiconductor
Slide13b) Magnet
Slide14All magnets
a) have two poles
b) Exert forces
c) Are surrounded by a magnetic field
d) All of the above
Slide15d) All of the above
Slide16The magnetic effects of a bar magnet are
Evenly distributed throughout a magnet
Distributed randomly in a magnet
Concentrated near the ends
None of the above
Slide17c) Concentrated near the ends
Slide18
Sometimes the magnetic strip on a credit card becomes demagnetized. The strip is most likely a
Permanent magnet
Temporary magnet
Electromagnet
geomagnet
Slide19b)Temporary magnet
Slide20If you attach a magnet to a string so that the magnet is
s
ee to rotate, you will see that one end of the magnet will point
North
Southwest
East
west
Slide21a) North
Slide22The Earth has neither an east pole nor west pole because
a)The earth is a sphere and has no poles
b) The earth is a sphere and has only one pole called an axis
c) The earth is like a bar magnet, which has two poles
d) None of the above
Slide23c) The earth is like a bar magnet, which has two poles
Slide24A compass needle is
A fixed magnet
A fixed nonmagnetic piece of metal
A magnet that is free to rotate
A nonmagnetic piece of metal that is free to rotate
Slide25C)
A magnet that is free to rotate
Slide26Magnetic poles always occur
Alone
In pairs
In threes
In fours
Slide27B)
In pairs
Slide28The magnetic force will pull magnets apart if you hold the
North poles of two magnets together
South poles of two magnets together
North pole of one magnet near the south pole of another magnet
Both A and B
Slide29d)Both A and B
Slide30The magnetic force will pull magnets together if you hold the
North poles of two magnets together
South poles of two magnets together
North pole of one magnet near the south pole of another magnet
Both A and B
Slide31C)
North pole of one magnet near the south pole of another magnet
Slide32Magnetic poles are similar to electric charges in that
Like poles repels and opposite poles attract
The magnetic force is equal to the electric force
The number of magnetic domains responsible for the poles is conserved.
The mass of magnetized particle is conserved
Slide33A)
Like poles repels and opposite poles attract
Slide34The magnetic field around a bar magnet can be modeled by drawing
Curved lines from the north pole of the magnet to the south pole
Curved lines near the south pole of the magnet
Straight lines from the north pole and from the south pole
Circular lines around the entire magnet
Slide35A)
Curved lines from the north pole of the magnet to the south pole
Slide36Whether a material is magnetic depends on _____ in the material
Molecules
Atoms
Number of neutrons
Number of protons
Slide37B)
Atoms
Slide38A magnet can be demagnetize if
a) it is dropped
b) it is heated
c)it is stuck very hard
d) all of the above
Slide39d) all of the above
Slide40A magnet, usually within an iron core, produced by an electric current is
Electromagnet
Ferromagnet
Temporary magnet
Permanent magnet
Slide41A)
Electromagnet
Slide42Turbines generally turn the _______ in a generator, inducing an electric current
Transformer
Magnet
Wire loop
solenoid
Slide43B)
Magnet
Slide44Which of the following is currently being used to turn turbines in generators?
a) steam
b) water
c) wind
d) all of the above
Slide45d) all of the above
Slide46The interaction between electricity and magnetism is called
a) electromagnetism
b) Electromagnetic induction
Slide47a) electromagnetism