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Practice Test
: Physics Vocab Ch. 32-33
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How do thunderstorms become negatively charged?
Electronic Polarization
How do you measure magnitude in an electric field?
What direction would a negative field be?
Superconductors
Why do conductors conduct electricity well?
electrostatics
Effects on small positive test charges in the field
electricity at rest
When temperatures approach absolute zero, some metals have infinite conductibility. We don't know why.
Friction
Rearrangement of positions of charges withing atoms caused by induction
Towards
They have loose out electron shells
Short Answer
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Electric fields vector quantities
Strength of an electric field =
insulators
How do insulators charge by induction?
Coulomb's Law
Multiple Choice
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What are electric field lines?
Easier ways to show vector quantities, farther apart lines are, weaker the field
F = kq1q2/d^2
charge can never be created or destroyed
Force field that surrounds charge. "Action at a distance"
charged atom
How do you measure direction of an electric field?
electricity at rest
Friction
One material rubs against another and literally scrapes electrons off
Direction on small positive test charge?
Charge flows readily to or from sharp points, and height helps.
conductors
One material rubs against another and literally scrapes electrons off
readily conduct electricity
Direction on small positive test charge?
do not conduct electricity
They have loose out electron shells
charge
charge can never be created or destroyed
Ions flow to the pointed rod above a building. Rod collects electrons from the clouds and a "sink," and prevents induction from lightening. It is also the hope that if lightening does occur, it will strike the lightening rod and be short-circuited to the ground, instead of hitting the building
an attracting or repelling behavior
Electrically polarized molecules in normal state
Charging by induction
Charged object near conducting surface
an attracting or repelling behavior
charged atom
Charged rod touches neutral objects, electrons flow to the neutral object, charging it
Both magnitude and direction
True or False
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Fundamental rule of all electrical phenomena
like charges repel; opposite charges attract
True
False
Semiconductors
readily conduct electricity
True
False
What direction would a positive field be?
Charged object near conducting surface
True
False
Electric dipoles
Electrically polarized molecules in normal state
True
False
How do lightening rods work
Ions flow to the pointed rod above a building. Rod collects electrons from the clouds and a "sink," and prevents induction from lightening. It is also the hope that if lightening does occur, it will strike the lightening rod and be short-circuited to the ground, instead of hitting the building
True
False
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Practice Test: Physics Vocab Ch. 32-33