Physics Exam 1 Flashcards
e =
1.602 x 10^-19 C
q = Ne
N is ____________
any integer
True or False:
Electric charge is always conserved
True
True or False:
Negative charge can be transferred between objects
True
________________
- substances that readily allow for the movement of electrons through the material
- good thermal conductors
Electrical Conductors
________________
- Substances that do not easily allow for the movement of electrons through the material
Electrical Insulators
________________
- Substances that can act as conductors or insulators, depending on the impurities present
Semiconductors
Negative charge can be transferred by rubbing two types of objects together, which is called charging by ____________
friction
The net charge of a neutral system before and after is always _________
zero
Charging by ____________
- placing a charged object in contact with a conductor allows for a redistribution of charge. If the charged object and conductor are identical, then the charge will redistribute equally. The redistribution of charge is due to like charges exerting repulsive forces on one another and unlike charges exerting attractive forces on one another
Conduction
Charging by _____________
- when a charged object is brought near a grounded, conducting object a redistribution of charge occurs on the conducting object. The redistribution of charge is due to like charges exerting
repulsive forces on one another and unlike charges exerting attractive forces on one another
Induction
Point charges that are positively and negatively charged exert electrostatic forces on one another in accordance with _______________
Coulomb’s law
Coulomb’s Law
- for electric force
Coulomb constant
ke =
8.9876 x 10^9 N·m^2/C^2
True or False:
The electrostatic force is always along a line joining q1 and q2
True
The ______________________
- the electrostatic force is a vector quantity and, therefore, when working with more than one electrostatic force vector acting on a point charge, vector mathematics must be applied
Superposition Principle
When a positive charge and a negative charge are placed near each other the charges accelerate toward each other because they each experience a force of attraction, where do the charges get the energy in order to increase their kinetic energy?
The electric field, due to the other charge
magnitude of the electric field at a point in space
electric field (vector quantity)
Electric field is a vector quantity, so it has an associated direction at that point in space. The direction of the electric field is the same as the direction of the electrostatic force on a ________________ test charge placed at that point.
positive
Electric field lines emanate from __________ charges and terminate on__________ charges.
positive
negative
The number of lines leaving a positive charge or entering a negative charge is
proportional to the _____________ of the charge.
Magnitude
True or False:
Electric field lines never cross.
True
True or False:
In the case of unequal charges or a single charge, the electric field lines will begin or end infinitely far away
True
The electric field is always _________ inside of a conductor in electrostatic equilibrium. When an electric field exists inside of a conductor, it causes electrons to move which results in
an electrical current.
zero
Excess charge will reside on the __________ of a conductor in electrostatic equilibrium
surface
Electric field lines are always_____________ to the surface of a charged conductor
perpendicular
True or False:
Charge accumulates on the surface of sharp points on an irregularly shaped conductor
True
