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96 Cards in this Set
 Front
 Back
electrostatics is the study of?

stationary or static charges and forces betw them


the force that exists betw stat charges is called the?

electrostatic force


si unit of charge is?

coulomb


e=?

1.60 X 10^19


t or f
e= q 
t


coulombs law is?

F=K (q1q2/r^2)


coulombs law gives the magnitude of the force of q1 on?

q2. and the force of q2 on q1


coulombs constant is?

1/4PI Eo= 8.99 X 10^9 Nm^2/C^2


Eo=

8.85 X 10 ^12C2/N(M^2)


when the distance betw 2 charges is doubled, the force is?

reduced to 1/4 of the original force


comparing the electrostatic and gravitational force betw 2 charges you can use?

newtons law and coulombs law


every electric charge sets up a ?

sorrounding electric field


How do you detect an electric field?

by the force it exerts on other electric charges


electric field is def as?

force on a stationary positive test charge qo divided by the charge


Electric field=?

F/qo


electric field E points in what direction?

the direct of the force F on the positive charge qo.


electric field units?

newtons/coulomb or volts/meter


volts/meter is the unit for?

electric field


a charge qo in an electric field E experiences a F=?

F=qoE


a posit charge in an electr field feels a force in the?

direction of the field


a negative charge in an electr field feels a force?

in the direction opposite the field


the force on a positive test charge qo placed a dist r from a charge q is?

F=kq(qo)/R^2


equation for the electr field an any dist r from a charge q=?

E=kq/r^2


direct of the electr field vector.
it points _________ from q if q is a positive charge. 
away


direct of an electr field
it points ______________ if q is a negative charge 
towards


field lines of an electric field are ?

imaginary lines that represent how a positive test charge would be accelerated in the electr field.


for a collect of charges, the total electr field at a point of space is?

the vector sum of the electric field due to each charge


electr field str is stronger where field lines are?

closer together


Etot=?

Etot= Eq1 + Eq2 + Eq3 (vector sum)


t or f
volt= j/c 
t


electric potential is

the amount of work needed to move a posit test charge qo from infinity to that point divided by the test charge.


t or f
V=w/qo 
t


w/qo= ?

V or electric potential


the electric potent of a posit charge is a?

positive number


the electr potential of a negativ charge is?

a negat number


V electric potential has units of?

volts or j/c


j/c and what are equivalent units

volts


electric potential at a point is defined as ?

the amount of work needed to move a positive test charge qo from infinity to that point divid by test charge qo


electric potent= v=

w/qo


w/qo is the?

electric potential at a point


the electr potentail of a positive charge is a ?

positive number


the electric potential of a negat charge is a?

negative number


equation for electric field at any distance from a charge q=

E= k (q/r^2)


direction of electric field for a positive q is?

points away


electric field vector points ___________ q if its negative

toward


electric field of a ___________ points radially outward

positive charge


elect field of a ______________ points radially inwards

neg ch


____________ represent how a positive charge would be accelerated in the electric field

field lines


direction of elect field is always _______ to the field line at that point and in the __________ direction

tangent
same 

where field lines are closer, the electric field is?

stronger


total electric field in a point in space is =

vector sum of the electric field due to each charge.


electr fields of separate charges add as ?

vectors


total electr potent at a point in space is the ____________ sum of electr potent due to each charge

scalar


potential difference is?

difference in potent betw 2 points


potential diff betw a and b is?

VbVa=Wab/qo


electrostatic force is
conservative or nonconservative? 
conservative


equipotential line is?

a line for which the potential at every point is the same


potent diff betw any 2 points on an equipotent line is?

zero


equipotential lines
work depends only on? 
potent diff of 2 lines and not on the path


t or f
work is done when moving a test charge qo from one point to another on an equipotential line 
f


amount of work necessary to move a ch in an electr field dep only on?

potential difference


electric potential e U of q is?

U=W=qV


electic potential energy equals?

charge times electric potential


change in U+

q times change in V


electric pot e
ΔU=qΔV 
qΔV


the sign of U depends on?

the signs of q and V


electric potential can be thought of as?

electric potential e per unit charge
U/q 

when V is due to one other charge Q V is ?

kQ/r


when V is due to one other charge Q U can be written as?

U=kqQ/r


electric potent e of a 2 charge system is positive when you have 2 ________ charges

like


electric potent e of a 2 charge system is negative when you have 2 ________ charges

opposite


if 2 charges are the same, then U will be?

positive


If a charge of +2e and a charge of 3e are separated by a distance of 3 nm, what is the potential energy of the system?
what equation do you use? 
U = k (qQ/r)


If a charge of +2e and a charge of 3e are separated by a distance of 3 nm, what is the potential energy of the system?
what is e? 
e=1.6 X 10^19


electric dipole is?

2 charges of equal magnitude and oppos signs separated by a small distance


potential at any 2 points for a dipole is?

V= k(q/r1)k(q/r2)
V=kq(r2r1/r1r2) 

for points relatively far from the dipole you can approximate the potential equation as?

V=k(qd/r^2)cosΘ


V=k(qd/r^2)cosΘ is used for what?

to approximate potential for a dipole


V=k(qd/r^2)cosΘ
qd is defined as? 
the dipole moment p


what are the units for dipole moment?

c(m)


t or f
the dipole moment is a vector quantity 
t


the dipole moment vector lies along?

the line conecting the charges (dipole axis) and point from the negative charge toward the positive charge


V=k(qd/r^2)cosΘ
can also be written in terms of dipole moment and becomes? 
V=k(p/r^2)cosΘ


V=k(p/r^2)cosΘ
what is p? 
the dipole moment
its equal to qd 

V=k(p/r^2)cosΘ
for a dipole the potential is _______ at Θ= _________ 
0,
90 

for a dipole the plane that lies halfway betw +q and q is called the?

perpendicular bisector of the dipole


electric dipole in a uniform external electric field
the net force the dipole feels will be? 
zero


electric dipole in a uniform external electric field
the dipole feels no ___________ force but it does feel a _____________ 
translational force
torque or rotational force 

electric dipole in a uniform external electric field
torque= 
torque= f(d/2)sinθ + f(d/2)sinθ


torque=fdsinf(d/2)sinθ force can be written as?

f=qe
so torque=qEdsinθ 

pEsinθ is used to figure out?

the nonzero torque about the center of the the dipole in an electric field.


p is ?

magnitude of the dipole moment
p=qd 

in torque=pEsinθ what is θ

the angle the dipole moment makes with the electric field


the torque on a dipole will cause the dipole to?

reorient itself by rotating so its dipole moment p aligns with the electric field


which of the following is a unit of energy?
a. eV b. V (m) c. V/m d. W 
a. eV
it is just an energy unit, not a combo of others. 

Given an electric dipole, the electric potential is zero
A. only at the midpoint of the dipole axis. B. anywhere on any perpendicular bisector of the dipole axis and at infinity. C. anywhere on the dipole axis. D. only for points at infinity. 
b. anywhere on any perpendicular bisector of the dipole axis and at infinity
