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Electricity and Magnetism
n/a
10
Science
8th Grade
04/21/2010

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Cards

Term
magnetic force
Definition
a push or a pull exerted by a magnet
Term
What must all magnets have?
Definition
a north and a south pole
Term
What happens if two north ends of a magnet are brought together?
Definition
they repel or push each other away
Term
What happens if a north enad and a south end of magnets are brought together?
Definition
they attract or pull towards each other
Term
magnetic field
Definition
the area surrounding a magnet in which the magnetic force exists
Term
Where is the magnetic force the strongest?
Definition
at the poles of the magnet
Term
electromagnetism
Definition
the production of a magnetic field by an electric current
Term
electromagnet
Definition
a magnet that is made by passing an electric current through a coil of wire wrapped around an iron core
Term
Why are electromagnets useful? (2 things)
Definition
they can be turned on and off; their strength can be controlled
Term
How can you increase the strenght of an electromagnet?
Definition
add more coils of wire, increase the size of the iron core, increase the strength of the energy source
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