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27 terms

PHYSICS

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what happens when a rubber rod is rubbed with a piece of fur, giving it a negative charge?
electrons are added to the rod
a repelling force occurs between two charged objects when the charges are of
like signs
an attracting force occurs between two charged objecst when teh charges are of
unlike signs
when a glass rod is rubbed with silk and becomes positively charged
electrons are removed from the rod
electric charge is
conserved
charge is most easily transferred in
conductors
the process of charging a conductor by bringing it near another charged object and then grounding the conductor is called
induction
both insulators and conductors can be charged by
polarization
a surface charge can be produced on insulators by
contact
conductors can be charges by *** while insulators cannot
contact
wwhich of the following is not true for both gravitational and electric forces?
a. the inverse square distance law applies
b. forves are proportional to physical properties
c. potential energy is a function of distance of seperation
d. forces are either attractive or repulses
a
electric field strength depends on
charge and distance
what occurs when two charges are moved closer together
the force between teh object increases
resultant force on a charge is the *** sum of individual forces that charge
vector
the electric field charge just ourside a charged conductor that is in electrostatic equilibrium is
zero
for a conductor that is electrostatic equilibrium, any excess charge
resides entirely on teh conductor's interior
if an irregularly shaped conductor is in electrostatic equilibrium, charge accumulates
evenly throughout the conductor
of a positively charged glass rod is used to charge a metal bar by induction, the charge on the bar
must be negative
which sentence best describes electrical conductors
a. they ahve low mass density
b.they have a high tensile strength
c.they have electric charges that move freely
d. they are poor heat conductors
c
which is most correct regarding electric insulators
a. charges within electrical insulators do not readily move
b.electrical insulators have high tensile strength
c. electric charges move freely in electrical insulators
d. they are good heat conductors
a
when a charged object is brought close to an uncharged body without touching it, a ** charge may result on the uncharged body. when a charged body is brought into contact with an uncharged body and then is removed a ** charge may result on the uncharged body
induced, residual
which is the most correct statement regarding the drawing of electric field lines
a.they always connect from one charge to another
b.they always form closed loops
c. they can start on a charge of either polarity
d. they never cross eachother
d
any force between two objects that are not touching is called a *** force
non contact
the space around a charged object contains the electric ***
field
explain what happens when you vigorously rub your wool socks on a carpeted floor, touch a metal doorknob, and get a shock
electrostatic- electrons from you
describe how a non conducting material, such as paper, becomes attracted to a negatively charged object brought near it
atoms rearrange
a negatively charged rubber rod is brought near a neutral, conductive sphere that has no charge. as a result part of the sphere closest the the rod becomes positively charged. explain how this positive charge occurs
polarization- atoms rearragnge