ELECTROSTATICS Flashcards
what is charge given in units of
coloumbs
charge affects subatomic particles in what way
identity
what are the two kinds of charge
what do like charges do
repel
what do opposite charges do
attract
positive charge comes from
more protons than e-
negative charge comes from
more electrons that p+
what is the law of conservation of charge
net charge of an isolated system remains constant
how is charge created
IT CANNOT BE CREATED
only transferred from one object to another
what happens when you rub a balloon on human hair
frictional charging process > transfer of electrons between the two objects that are rubbed together
between rubber and hair, which has a greater attraction for electrons
rubber
greater attraction for electrons
electron loving material
what happens when a rubber and hair frictional attraction are affected
BALLOON pulls more electrons in and become negatively charged
HAIR has electrons removed becoming positively charged
what is a conductor
materials that allow electrons to flow through
what is an insulator
materials that resist the free flow of electrons and thus resist charge
how does a conductor allow electrons to flow through
allow for the transfer of charge via the free movement of electrons
what is coloumbs law
electrical forces between two charged objects are
directly proportional to the product of the quantity of charge on the objects
inversely proportional to the square of the distance separating the two charged objects
what is coloumbs constant
8.99 x 10^9 NM2/c2
what can a charge generate in environments
electric field
what is an electric field
electric force per unit charge.
what will the electric force on an object exert
electric field of an object will exert a force on a second object that is in the proximity of its field
how does the force exerted on a second object by a first object with an electric field depend on certain conditions
depends on charge upon that object
and charge generating the field
what is the basic equation to calculate electric field
E = F/q
what is the electric field equation
E = kQ/r2
Where K - 8.99 x 199
Q = charge creating the field
r2 = distance between
what do electric field line diagrams show
direction of force.
how are arrowheads drawn for positive atoms
arrowheads are pointed away from positive charges
how are arrowheads drawn for negative atoms
arrowheads are pointed toward negative charges
what happens if a beam of electrons is moved perpendicularly to an electric field between two horizontal planes
accelerated vertically (toward the positive plate)
how is velocity of electrons affected when a beam of electrons is passed through an electric field
it’s not affected
why is an electron beam attracted to a differing negative and electric plane of an electric field?
It will be attracted by the positively charged upper plate and repelled by the negatively charged lower plate
how does potential energy arise from charges
charge exerts force on another charge
energy comes from collection of charges
what happens if perpendicular movement hits an electric field
does not result in a change in potential
why does perpendicular movement not affect an electric field
follows lines called equipotential lines/surfaces
what property do all the lines in an equipotential surface share
same voltage
is work done when an electron is sent across an equipotential line
no
how is an electric dipole created
created by two opposite charges that have equal magnitude
how do you calculate electric dipole momvement
multiply the charge on one charge by the distance
what is the equation for electric dipole movement
p = qd
