IASD AP Physics II, ELECTRIC POTENTIAL
Since the change in potential energy equals qV and the charge on an electron is the elementary charge, then 1ev= how many joules?
1.60 X 10⁻¹⁹ J
A power supply is device that
Acts like a battery
lines of equal potential
Are perpendicular & form concentric circles around the charge
Potential has its highest mag
At the surface of a charge & diminishes to 0 at infinity
W equals
Change of KE
Which of the following choices represents the quantity that is equal to the electric potential?
EPE/q
A positively-charged particle is held at point A between two parallel metal plates. The plate on the left has a net positive charge +q and the plate on the right has a net negative charge q. The particle is then moved to point B. How does the electric potential energy at point A compare with that at point B?
EPEA > EPEB
Electric Potential can be thought of as an
Electrical pressure at a point a in space
This potential provides the
Electrical pressure needed to push charges throughout a circuits
Equipotential lines
Every point on a particular equipotential line has the same potential
High voltage
High potential for charges to move & greater chance of an electric shock
Electric Potential is 0 at
Infinity
Electric potential
Is unique to charged objects
Neg charges
Low neg potential
When the electric field is perpendicular to an equipotential surface work being done when a charge moves along it?
No work is being done
Which one of the following statements concerning equipotential surfaces is false?
No work is done by the net electric force as a charge moves from one equipotential surface to another.
Neg charges move
Opposite of the electric field
If KE is increasing
PE is decreasing
The Electric Field of point charges are radially oriented
Point away from Pos & toward - charges
Electric potential is a
Scalar quantity measured in V
Electric potential can be viewed as line
That are perpendicular to the electric field & equally spaced
. Point charge A is located at point A and point charge B is at point B. Points A and B are separated by a distance r. To determine the electric potential at the mid-point along a line between points A and B, which of the following mathematical approaches is correct?
The algebraic sum of the two electric potentials is determined at a distance r/2 from each of the charges, making sure to include the signs of the charges.
The mag of the field has a max value at the surface of
The charge & becomes weaker with the inverse square of the distance from the center of the charge
Which one of the following statements best describes the equipotential surfaces surrounding a point charge?
The equipotential surfaces are concentric spheres with the charge at the center.
Which one of the following statements concerning equipotential surfaces is true?
The net work done by electric forces that move a charge along an equipotential surface is equal to zero joules.
. Points A, B, and C lie along a line from left to right, respectively. Point B is at a lower electric potential than point A. Point C is at a lower electric potential than point B. Which one of the following statements best describes the subsequent motion, if any, of a positively-charged particle released from rest at point B?
The particle will accelerate in the direction of point C.
Two positive point charges are separated by a distance R. If the distance between the charges is reduced to R/2, what happens to the total electric potential energy of the system?
The total electric potential energy is doubled.
. Which one of the following statements is true concerning the work done by an external force in moving an electron at constant speed between two points in an electrostatic field?
The work done depends only on the displacement of the electron.
what is the equation for calculating PE between two point charges
V=kq/r
When a charge is moved between equipotential surfaces, what is the equation for work done?
W=qV
Electric Potential is associated
With electric potential energy Work of electricity Conservation of energy
Electric potential energy is defined in a similar manner to the gravitational potential energy. Complete the following statement: These two potential energies are analogous to each other because
both the electric and gravitational forces are conservative forces.
∆V = ∆U / q
change in electric potential
Since the electrostatic force is a __________ force, a potential energy can be associated with it.
conservative
An increase in r results in a
decrease in V
What is the name of unit of energy that is the amount by which the electric potential energy of an electron when it moves through a potential difference of one volt?
electron volt (eV)
Complete the following statement: The electron volt is a unit of
energy.
Electric potential energy is analogous to this type of energy.
gravitational potential energy
-W
if W is the work done by an electric force, the change in a charge's electrical potential energy, ∆U, is defined by ___
since electric potential is a scalar quantity...
if multiple charges are present the total electric potential is found by adding the potential due to each charge (no need to take into account direction).
electric potential difference definition
is energy per unit charge
units of electric potential are measured in
joules per coulomb, or volts
Pos charges accelerate in the direction
of the electric field
equipotential surface
one in which all points on the surface are at the same potential
Volt
one joule per coulomb is called one ___
When a charge is placed in an electric field, the charge experiences a force. Work is done on the charge by the field when it moves ____________ (direction) to the field.
parallel
electric field is always ___________ to an equipotential surface.
perpendicular
. A conducting sphere is connected via a wire to the ground. For a very short time, electrons move from the ground to the sphere. Then, no more electrons move to the sphere. Complete the following sentence: Before the wire was connected, the sphere's electric potential had a
positive value.
The amount of work required to move a charge against the field would equal the increase in __________ energy.
potential energy
V is directly proportional to
potential energy
Define electron volt
the amount by which the potential energy an electron changes when the electron moves through a potential difference of one volt.
Which one of the following phrases best describes the electric potential of a charged particle?
the potential energy per unit charge
Which of the following units are the SI units for the electric potential?
volt (V)
Work is done
when a charge moves in an electric field
∆V= ?
∆U/q