9. Electrostatics Flashcards
what is the unit of charge
coulombs
what are conductors and what do they allow
materials that allow e- to flow through
allow for the transfer of charge via the free movment of e-
what are insulators and what do they resist
resist free flow of e- and resist charge
what does coulombs law states
electrical forces between 2 charged objects are directly proportional to product of the quantity of charge on the object and inversely proportional to the square of the distance separating the 2 charged objects
what is the equation for calculating force between any 2 charges
F = k(q1q2)/r^2
k = 8.99^9Nm^2/C^2
r = distance between centers of charge
what is an electric field
electric force per unit charge
the electric field of an object will do what to the second object that is in the proximity of its field
exert force
what is the equation for calculating the electric field
E = F/q = kQ/r^2
E = electric field
F = force
q = charge placed in field
Q = charge creating the field
is a beam of e- is moving perpendicular to an electric field created between 2 horizontal plates they experience what motion
why does it experience this
accelerated vertically towards the positive plate
e- negative charge so attracted by + charged upper plate and repelled by the - charged lower plate
what does varying the potential applied to the plates will have what effect on the angle of vertical acceleration and velocity of e-
alter the angle of vertical acceleration
velocity of e- is not affected
how does potential charge arise
charge will exert a force on any other charge and potential energy arises from any collection of charges
will perpendicular movement to electric field result in change in potential
no
perpendicular movement follows lines called ___
equipotential lines/surfaces
what is the voltage along the equipotential surface
all points have the same voltage
when a charge is moved along a equipotential line is work done
no
