dry days because there is not enough moisture to "connect" the charges
when does one notice static charges most?
rub hair with balloon, the balloon becomes negatively charged and your hair becomes positively charged
negative electrons move ________ material rather than protons
protons are too __________ inside the nucleus
atoms that have gain or lost electron and therefore have a charge
charges can only be....
a charged object's charge is always a multiple of a fundamental charge (quantized)
what did Millikan discover?
Millikan's Oil Drop experiment
-Observed the motion of oil drops between two parallel charged plates -Gravity initially pulled the droplets down - when the top plate was given a positive charge, the droplets with negative charges were attracted to the top plate
fundamental charges is the charge of...
what is the SI unit for charge?
what is the variable for charge?
materials that allow charges to flow easily from them
materials that do not allow charge to flow through them
normally insulators, but adding specific atoms as impurities can turn them into conductors (silicon, germanium - used a lot in electronics)
zero electrical resistance when below a certain temperature - can conduct electricity without heating up
rubbing two materials together - one object rubs the electrons off the other, making it positively charged
t/f both insulators and conductors can be charged by contact
conductor connected to the Earth by a conducting wire or copper pipe
A neutral conductor is brought near another charged object, then the conductor is grounded - no touching necessary
only _____ can become charged by induction
A surface charge can be induced on insulators by....
shifting of charge within an atom
polarized object have a net charge of...
polarization ______ ______ require contact, just proximity
The closer two charges are, the greater the force of attraction or repulsion between them
F = (kq1q2)/r2
what is the equation for coulomb's law?
what is coulombs constant?
point charges or particles and spherical distribution of charges
Coulomb's Law only applies to....
force between two objects that are not in contact with each other
electric forces can either be ________ or _______
area around a charge where the charge can be "felt" by another object
used to detect the presence of an electric field
E = Felectric/qo
what is the equation for electric field?
what is the unit for electric field?
Lines closer together=
two equal in strength, same charges - field lines are identical and turn away from each other
Electric field is ____ inside the conductor
Charges reside only on the ______ of the material.
Electric field is _____ to the material's surface
Charges accumulate at points for _______ shaped objects
Like Charges do this
Does the magnitude of a test charge affect the electric field of the charge?
positive to negative
Electric field lines point in this direction
Coulomb's law does not tell the ____ of the electric field force.
Close electric filed lines mean _________ charge.
Charge by touching
Charge transfer without touching
equal and opposite
Two charges exert _____ and _____ forces on each other.
The electric field strength inside a hollow, charged metal ball
He measured the charge on an electron
Symbol for charge
Sign of a "test charge"
Charge value for a proton
Unit for electric field
Unit for charge
Natural example for static discharge
Area around a charge where it can be "felt"
Name for the equation F = k(q1q2)/r2
Charge that doesn't move
Opposite charges will do this
When rubbing a balloon on your head, the balloon becomes ____ charged.
Value of Coulomb's constant
Charges accumulate on the __________ of a sphere
Tool used to determine the presence of a charge.
accumulation of electric charges on an object
exerts a force on anything that has an electric charge