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30 Cards in this Set
- Front
- Back
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A region of magnetically aligned atoms is called?
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magnetic domain
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dropping a magnet causes the ______ to become unaligned.
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atoms
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the aurora borealis (northern lights) are caused by
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magnetic fields
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a stationary electric charge is surrounded by an
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electric field
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A moving electric charge is also surrounded by a
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magnetic field
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which of these is the best insulator?
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rubber
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the resistence of a supercoduct is
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very small
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in a charging process,____ are gained or lost
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electrons
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rubbing a balloon is an example of charging by
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contact
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a lightning rod serves to conduct electricity into the
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ground
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When the distance between two charged particles is doubled, the force between them becomes ___ as strong
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1/4
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When you double the charge on one of a pair of objects, the force becomes
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twice
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To increase the electric current in a wire,______ the______
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increase, voltage
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a___________ wire has less resistance than its opposite
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thick
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A magnetic field is produced by moving a
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charged particle
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a compass needle at the north magnetic pole would point ____.
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straight up and down
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The earth's _____ protects us from cosmic rays
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Van Allen Radiation Belts
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For electromagnetic induction to occur, the _____ must change
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magnetic field
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voltage can be induced in a wire by moving a _____ near it
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magnet
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a generator is a _____ working in reverse
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motor
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turbines are commonly powered using_____
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steam
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the advantage of AC over DC is that ____ can easily be changed
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voltage
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The ______ is positively charged
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proton
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In a neutral atom, how do the number of electrons and protons compare?
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the same number
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Normally, the net charge on an atom is
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zero
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an ion is an atom that has
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gained or lost electrons
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to be a good conductor an atom needs
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freely flowing electrons
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gravity, electric, and magnetic are examples of
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fields
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when a charged object comes near an electroscope, the leaves
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spread apart
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the unit of measure of resistence is
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ohms
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