Download Chapter 24 Electric Potential

Review for Electric Potential +Capacitance Exam
Chapter 24 Electric Potential
Notes <1-57> Assigned Homework (Q9,4,16,17,23,24,31,32a,34,35,36,41,45,47,63,67,90,91,93,101,108)
 Understand the concept of electric potential, be able to:
o calculate how much work is required to establish the charge system. <3,5>(41)



o
Calculate the electrostatic potential energy of a system of two or more point
charges<6a,7>

o
Determine the electric potential in the vicinity of one or more point charges.
<11,12,13,14,16,36>(45,90)

o
Find where the potential is zero due to two point charges <12,13>(16,17)

2 positions because it is a scalar quantity!
Know your formulas!<8>
Understand the concept of electric potential difference, be able to:
o Calculate the electrical work done on a charge or use conservation of energy to determine
the speed of a charge that moves through a specified potential difference.
<19,33,34,35,39>(47)

U=qV=1/2 mv2
o Calculate the work done on a charge when moving in an equipotential diagram
<22,23,24,56f>(4)
 W=qV
o Determine the direction and approximate magnitude of the electric field at various
positions given a sketch of equipotentials. <20,21,22>(91)
 Downhill!
o Draw equipotential surfaces for given charge distributions <20,21,32,56>(91)
 Point charges= circles
plane of charge = planes
o Use integration to determine electric potential difference between two points on a line,
given electric field strength as a function of position along that line.<27,30>(35)

o

Use a derivative to find the electric field given the electric potential as a function of
position<27,28,29,36>(34)

Derive expressions for electric potential as a function of position (This means using Gauss’ Law
first!).
o Oppositely-charged parallel plates. (no integration necessary due to uniform E) <32>(36)

V=-Ed
o
o
o
Conducting sphere (Inside and outside!) <42-47,49-51>(63,67)
 Draw graph of electric potential/electric field inside and outside
 Inside E=0 and V=constant=kQ/R
Insulating sphere (Inside and outside!) <52-54,57>(93)

Cylinder of charge <56>
 Draw graph of electric potential/electric field inside and outside<56>

Non-uniform <56g>(32a)



 Empty space (93)
Use the principle of superposition to calculate by integration the electric field and the electric
potential
o on the axis of a thin ring of charge, <37,38,39>(23,101)
o at the center of a circular arc of charge. <41>(24,31)
o
r is from charge to point in space,

r is from charge to point in space,
Chapter 25 : Capacitance Notes “You must have the capacitor to charge up for this Chapter! Or you
have no potential! “(1-38) Homework <2,5, 9,11,12,29,32,34,35,43,46a,53ab>
 draw a diagram for a circuit using arrows for conventional current (electric field direction)
(5)
 Know what capacitance depends on and be able to find the capacitance for a parallel plate
capacitor (7,8,9) <2,5>

Find the energy stored by a capacitor (10,11,12)<29,32>

Describe the electric field inside the capacitor, and relate the strength of this field to
the potential difference between the plates and the plate separation. (6)
o V=Ed




Know what happens when the distance between the plates increases with and without a battery
(14)<35>
o Battery maintains electric potential difference
o No battery means charge is trapped on capacitor
Be able to find a new capacitance with a dielectric (with and without battery)
(15,16,18,19,20,21,22,24) <42,45>

Be able to find the capacitance if a metal is placed between the two parallel plates (17)
Be able to add capacitors in series and or parallel (25-36) <9,11,12>
 Series: Q=, V+
 Parallel: Q+, V=
o Find charge on any individual capacitor
o Find electric potential difference across any individual capacitor
o Find energy stored by combination or individual
Be able to use Gauss’ Law to find electric field inside and outside a

o Parallel plate capacitor (4)
o Cylindrical capacitor (37) <43,46>
o Spherical capacitor (38) <53>
Be able to find the potential difference between plates of a

o Parallel plate capacitor (6,23)
o Cylindrical capacitor (37) <43,46>
o Spherical capacitor (38) <53>
Be able to use C=Q/V to determine the capacitance of a
o Parallel plate capacitor (7)
o
o
Cylindrical capacitor (37) <43,46>
Spherical capacitor. (38) <53>