Term
What is static electricity? What is the basic law of electostatics? |
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Definition
charge that's not moving; opposites attract, likes repel |
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Term
How do objects become charged? |
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Definition
by either gaining or losing electrons |
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Term
What is the unit of charge? What is the symbol for charge? |
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Definition
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Term
What is the charge of an electron? |
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Definition
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Term
What are three ways to transfer charge? |
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Definition
friction, conduction, induction |
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Term
What type of charge does friction result in? |
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Definition
one positive, one negative |
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Term
What type of charge results with conduction? |
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Definition
same sign you started with |
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Term
What type of charge does induction result in? |
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Definition
opposite charge than what you started with |
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Term
Describe the way charge moves in induction and conduction using electroscopes. |
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Definition
always describe in terms of electron because only electrons can move |
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Term
What factors affect the size of an electric force? |
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Definition
amount of charge, how far apart they are |
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Term
What is the Coulomb's law? |
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Definition
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Term
How do you use Coulomb's law if there are more than two charges? |
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Definition
do two at a time (#12 on homework) |
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Term
What is the difference in an electrical conductor and an electrical insulator? |
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Definition
electrical conductors have electrons that move from atom to atom |
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Term
What are some example of conductors and insulators? |
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Definition
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Term
What is an electric field? |
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Definition
area around a charge where a force will be felt on another charge |
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Term
How do you determine the intensity of an electric field? |
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Definition
force per test charge E=f/q |
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Term
How can you determine the intensity by looking at an electric field map? |
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Definition
number of lines, more lines=stronger field |
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Term
What is electic potential? |
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Definition
change in potential energy per unit charge across a field---V=w/q |
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Term
What are other names for electric potential? |
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Definition
voltage, potential difference, potential drop |
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Term
What is the unit for electric potential/ |
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Definition
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Term
How do you determine the electrical potential in an electric field? |
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Definition
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Term
What causes a spark discharge across a field? |
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Definition
when the potential gradient is so large, it ionizes the field |
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Term
What is a uniform field? What is the potential gradient of a uniform field? |
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Definition
electric field intensity crosses across |
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Term
What are equipotential (lines) surfaces? |
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Definition
lines in which charge is equal |
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Term
Describe the distribution of charges on conductors. |
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Definition
charges stay on outside and accumulate in area that are more pointed |
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Term
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Definition
device made of 2 conductors separated by an insulator used to store a charge |
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Term
What are the 3 factors that determine teh amount of charge stored by a capacitor? |
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Definition
area of plates, distance they are separated, type of insulator |
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Term
What is the unit of capcitance? How do you determine the capcitance of a capcaitor? |
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Definition
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Term
How do you determine the amount of charge stored by a capacitor? |
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Definition
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Term
What is a dielectric? How does changing a dielectric affect the capacitance, the charge, and the electric field of the capcitor? |
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Definition
insulator between plates; increases capacitance, increases charge, reduces the electric field of the capacitor |
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Term
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Definition
a material that has free electrons that can flow from one atom to another |
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Term
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Definition
a material in which the electrons are bound to a particular atom and are not free to move across the surface |
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Term
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Definition
a device that enables you to see the presence of a electrostatic charge |
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Term
What is a residual charge? |
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Definition
a charge that remains on an object after the charged object is removed |
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Term
What is the magnitude of one coulomb? |
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Definition
6.24 x 10 to the 18 electrons |
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Term
If an electron at a certain distance from a charge particle is attracted with a certain force, how will the force compare at twice the distnace? |
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Definition
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Term
What is the sign of the test charge? |
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Definition
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Term
equation for spherical charge |
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Definition
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Term
What is the difference between q and Q? |
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Definition
q is the test charge; Q is the spherical charge |
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Term
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Definition
the number of lines per area |
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Term
as charge increases, what happens to the number of lines? |
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Definition
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Term
Where do the lines begin and end? |
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Definition
begin on positive, end on negative |
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Term
How can you tell the strength of the field by looking at the lines? |
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Definition
the more lines, the stronger the field |
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Term
What happens in a uniform field? |
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Definition
the field lines stay the same distnace apart; the valueof E is constant |
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Term
How is field strength related ot potential gradient? |
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Definition
in a uniform field, the potential gradient is equal to the field strength |
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Term
What themilikan oril drop experiment determine? |
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Definition
the charge of the elctron |
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Term
The electric field inside the conductor is_____. |
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Definition
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Term
Can there be a potential difference between two points on the surface of a conductor? |
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Definition
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Term
Electirc lines of force are always ____to equipotential surfaces. |
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Definition
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Term
Where do charges accumulate on a conductor? |
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Definition
areas of greater curvature |
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Term
If a large and small sphere have the same charge, which one will have a lower potential? |
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Definition
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Term
If a large and small sphere have the same potential, then which one will have more charge? |
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Definition
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