# Shared Flashcard Set

## Details

Static Electricity Chapters 20 and 21
questions
52
Physics
03/12/2013

Term
 What is static electricity? What is the basic law of electostatics?
Definition
 charge that's not moving; opposites attract, likes repel
Term
 How do objects become charged?
Definition
 by either gaining or losing electrons
Term
 What is the unit of charge? What is the symbol for charge?
Definition
 Coulomb; Q
Term
 What is the charge of an electron?
Definition
 1.6 x 10 to the -19
Term
 What are three ways to transfer charge?
Definition
 friction, conduction, induction
Term
 What type of charge does friction result in?
Definition
 one positive, one negative
Term
 What type of charge results with conduction?
Definition
 same sign you started with
Term
 What type of charge does induction result in?
Definition
 opposite charge than what you started with
Term
 Describe the way charge moves in induction and conduction using electroscopes.
Definition
 always describe in terms of electron because only electrons can move
Term
 What factors affect the size of an electric force?
Definition
 amount of charge, how far apart they are
Term
 What is the Coulomb's law?
Definition
 F=k(q1q2/d squared)
Term
 How do you use Coulomb's law if there are more than two charges?
Definition
 do two at a time (#12 on homework)
Term
 What is the difference in an electrical conductor and an electrical insulator?
Definition
 electrical conductors have electrons that move from atom to atom
Term
 What are some example of conductors and insulators?
Definition
Term
 What is an electric field?
Definition
 area around a charge where a force will be felt on another charge
Term
 How do you determine the intensity of an electric field?
Definition
 force per test charge E=f/q
Term
 How can you determine the intensity by looking at an electric field map?
Definition
 number of lines, more lines=stronger field
Term
 What is electic potential?
Definition
 change in potential energy per unit charge across a field---V=w/q
Term
 What are other names for electric potential?
Definition
 voltage, potential difference, potential drop
Term
 What is the unit for electric potential/
Definition
 volt
Term
 How do you determine the electrical potential in an electric field?
Definition
 V=w/q
Term
 What causes a spark discharge across a field?
Definition
 when the potential gradient is so large, it ionizes the field
Term
 What is a uniform field? What is the potential gradient of a uniform field?
Definition
 electric field intensity crosses across
Term
 What are equipotential (lines) surfaces?
Definition
 lines in which charge is equal
Term
 Describe the distribution of charges on conductors.
Definition
 charges stay on outside and accumulate in area that are more pointed
Term
 What is a capcitor?
Definition
 device made of 2 conductors separated by an insulator used to store a charge
Term
 What are the 3 factors that determine teh amount of charge stored by a capacitor?
Definition
 area of plates, distance they are separated, type of insulator
Term
 What is the unit of capcitance? How do you determine the capcitance of a capcaitor?
Definition
Term
 How do you determine the amount of charge stored by a capacitor?
Definition
 CV=Q
Term
 What is a dielectric? How does changing a dielectric affect the capacitance, the charge, and the electric field of the capcitor?
Definition
 insulator between plates; increases capacitance, increases charge, reduces the electric field of the capacitor
Term
 What is a conductor?
Definition
 a material that has free electrons that can flow from one atom to another
Term
 What is an insulator?
Definition
 a material in which the electrons are bound to a particular atom and are not free to move across the surface
Term
 What is an electroscope?
Definition
 a device that enables you to see the presence of a electrostatic charge
Term
 What is a residual charge?
Definition
 a charge that remains on an object after the charged object is removed
Term
 What is the magnitude of one coulomb?
Definition
 6.24 x 10 to the 18 electrons
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?
Definition
 1/4
Term
 What is the sign of the test charge?
Definition
 a small positive charge
Term
 equation for spherical charge
Definition
 E=k (q/d squared)
Term
 What is the difference between q and Q?
Definition
 q is the test charge; Q is the spherical charge
Term
 What is flux density?
Definition
 the number of lines per area
Term
 as charge increases, what happens to the number of lines?
Definition
 it increases
Term
 Where do the lines begin and end?
Definition
 begin on positive, end on negative
Term
 How can you tell the strength of the field by looking at the lines?
Definition
 the more lines, the stronger the field
Term
 What happens in a uniform field?
Definition
 the field lines stay the same distnace apart; the valueof E is constant
Term
 How is field strength related ot potential gradient?
Definition
 in a uniform field, the potential gradient is equal to the field strength
Term
 What themilikan oril drop experiment determine?
Definition
 the charge of the elctron
Term
 The electric field inside the conductor is_____.
Definition
 zero
Term
 Can there be a potential difference between two points on the surface of a conductor?
Definition
 no
Term
 Electirc lines of force are always ____to equipotential surfaces.
Definition
 perpendicular
Term
 Where do charges accumulate on a conductor?
Definition
 areas of greater curvature
Term
 If a large and small sphere have the same charge, which one will have a lower potential?
Definition
 the large one
Term
 If a large and small sphere have the same potential, then which one will have more charge?
Definition
 the large sphere
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