Physics-Electrostatic
If you comb your hair and the comb becomes positively charged, your hair becomes___
Negatively charged
Conservation of charge means that___
The total amount of charge in the universe is constant, no experimenter has ever seen a single charge destroyed by itself, electrons by themselves can neither be created nor destroyed, and charge can be neither created nor destroyed
Charge has to be a multiple of____
+/- 1.6 x 10⁻¹⁹
Coulomb constants for electrons and protons:
1 p+ = +1.6 x 10⁻¹⁹ C 1 e- = -1.6 x 10⁻¹⁹ C
A charged object touches a neutral object, electrons are transferred causing a neutral object to become the same charge as the originally charged object
Conduction
When two or more objects (conductors only) are brought together (touching), any charges that were present on the objects will neutralize each other as much as possible, then any remaining charge will be distributed among the object evenly.
Distribution of charge
The area around a charge in which its force can affect other objects; arrows drawn for a positive test charge placed in the field
Electric Field
T/F: Opposite charges repel each other.
False
T/F: The direction of lines of force shows how large a force will be on a charge placed in an electric field.
False
T/F: Two objects with the same type of charge attract each other.
False
When two objects are rubbed together, they cause a transfer of electrons
Friction
The removal of excess charge from an object by a substantially larger object (ex. lightning)
Grouding
A method of charging an object without touching it to another object
Induction
Objects can be charged by___
Induction, friction, and touching
The acceleration of an object due to an electrical force can be found by applying F=ma
Newton's second law
____charges are attracted to eachother
Opposite
Occurs when a charged object causes a movement/shift of electrons (slightly negative side and a slightly positive side)
Polarization in a conductor
Electrons are not free to shift throughout an object; however, they can shift in the molecules of an insulator
Polarization in an insulator
An imbalance of charge that is caused by the shifting of electrons
Static Electricity
Two charges are separated by a certain distance. If the magnitude of each charge is doubled, the force on each charge is___
Quardruples
When the distance between two charged is halved, the electrical force between the charges____
Quardruples
A difference between electrical forces and gravitational forces is that electrical forces include___
Repulsive interactions
___charges repel
Same
In a good insulator, electrons are usually___
Tightly bound in place
T/F: A bolt of lightning is a result of charging by induction.
True
T/F: A charged object will induce a separation of charges within a neutral conductor.
True
T/F: A material that is a good insulator of electricity is normally a poor conductor of electricity.
True
T/F: All electrons are identical; all have exactly the same mass and charge.
True
T/F: An object that exhibits electric interactions after rubbing is described as charged.
True
T/F: Charge can neither be created nor destroyed
True
T/F: Charges added on one part of an insulator remain on that part.
True
T/F: Charges added to a conductor quickly spread over the surface of the object.
True
T/F: Coulomb's constant (K) is 9.0 10^9 N•m2/C2.
True
T/F: Coulomb's law for electrical charges has the same mathematical form as Newton's law of gravitation.
True
T/F: Electric charge is neither created nor destroyed; it is conserved.
True
T/F: Electric charges exist within atoms.
True
T/F: Electrostatics is described as the study of electric charges that can be collected and held in place.
True
T/F: Like charges repel, whereas opposite charges attract.
True
T/F: Objects can be charged by the transfer of electrons.
True
T/F: The density of electric field lines is related to the strength of the field.
True
T/F: The direction of the force on a positive test charge near another positive test charge is away from the other charge.
True
T/F: When a charge is placed in a region of space where there is an electric field, the charge will experience a force.
True
T/F: When we allow charges to move onto or off a conductor by touching it with something connected to Earth, it is common to say that we are grounding.
True
