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22 Cards in this Set
- Front
- Back
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North end of a magnet is always attracted to the ____ end of another magnet.
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south
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South pole of a magnet ___ south pole of another magnet.
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repels
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North pole of a magnet ____ north pole of another magnet.
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repels
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(True/False) When a bar magnet is cut in half, a north only and a south only magnet are created.
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False. Cutting creates 2 new magnets
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How can you make a permanent magnet?
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Stroke a piece of iron on a magnet.
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What special kind of magnet would this be if it were connected to a battery?
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An electromagnet
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Based on the magnetic lines of force, these two magnets are ____ each other.
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attracting
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Based on the magnetic lines of force, these two magnets are ______ each other.
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repelling
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If the left-most pole is South, as shown, what is the order of the other 3 poles, not shown?
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North, South, North
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If the left-most pole is South, as shown, then what are the remaining poles, not shown, in order?
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North, North, South
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What are two things you could do to an electromagnet to make it stronger?
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a) increase the number of coils of wire
b) use a stronger battery |
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When electricity flows through a wire, does it create a magnetic field?
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Yes
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When a magnet is thrust in and out of a coil of wire, does electricity flow through the wire?
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Yes
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A device that spins a coil of wire in a magnetic field that makes electricity is called a....
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generator
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A device that takes electricity into a coil of wire and spins all by itself in a magnetic field is called a....
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motor
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Are electric motors and generators really about the same, whereby motors use electricity and generators make electricity?
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Yes.
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A magnet can be destroyed by ___ it and ___ it.
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beating
heating |
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Is the earth a gigantic magnet?
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Yes
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Is a compass needle a magnet?
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Yes
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Why does a compass needle always point in the same direction?
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Because the earth's magnetic field is always acting on it.
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Where, on a magnet, is the magnetic field the weakest?
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In the middle, halfway between N and S poles
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If you saw a magnet in half, do you get a north-only magnet and a south-only magnet?
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No. You CANNOT separate the poles. You would get two new shorter magnets, each with a N & S pole.
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