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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