B. Conductors On-line quiz
15 points each question
300 points total
31. The
dielectric constant has dimensions of:
a. N/C
b. Farad
c. volts
d. eV
e. dimensionless
32.
Electric potential has units of:
a. N/C
b. Farad
c. volts
d. eV
e. dimensionless
33.
Capacitance has units of:
a. N/C
b. Farad
c. volts
d. eV
e. dimensionless
34.
Electric Potential Energy may be expressed in units of:
a. N/C
b. Farad
c. volts
d. eV
e. dimensionless
35.
Capacitance is ÷o
A/d for:
a. all capacitors
b. concentric
cylinders
c. parallel plates
d. parallel wires
36. Given
3 capacitors: 4.00 mF, 7.00 mF, and 9.00 mF;
what is the equivalent capacity if they are connected in series?
a. 1.98 mF
b. 3.00 mF c. 2.98
mF d. 5.00 mF
37. Given
3 capacitors: 4.00 mF, 7.00 mF, and 9.00 mF;
what is the equivalent capacity if they are connected in parallel?
a. 22.00 mF
b. 20.00 mF
c. 6.75 mF d. 3.25 mF
Page 2
38.
Consider a uniform electric field of 50 N/C directed toward the east.
If the voltage measured relative to ground at a given point in the field
is 80 V, what is the voltage at a point 1 m directly south of that point?
a. zero
b. 30 V
c. 50 V
d. 80 V
39. The
absolute potential at a distance of 2 m from a positive point charge is 100 V.
What is the absolute potential 4 m away from the same point charge?
a. 25 V
b. 50 V
c. 200 V
d. 400 V
40. A
battery charges a parallel-plate capacitor fully and then is removed.
The plates are immediately pulled apart.
(With the battery disconnected, the amount of charge on the plates
remains constant.) What happens to the potential difference between the plates
as they are being separated?
a. It increases.
b. It decreases.
c. It remains constant.
d. There is no way
to tell from the information given.
41. The
plates of a parallel-plate capacitor are maintained with constant voltage by a
battery as they are pulled apart. During
this process, the amount of charge on the plates must
a. increase.
b. decrease.
c. remain
constant.
d. either increase
or decrease. There is no way to
tell from the information given.
42. The
plates of a parallel-plate capacitor are maintained with constant voltage by a
battery as they are pulled apart. What
happens to the strength of the electric field during this process?
a. It increases.
b. It decreases.
c. It remains constant.
d. There is no way
to tell from the information given.
Page 3
43. If
a Cu2+ ion drops through a potential
difference of 12 V, it will acquire a kinetic energy (in the absence of
friction) of
a. 12 eV
b. 6 eV
c. 24 eV
d. none of the
above.
44. The
electron-volt is a unit of
a. voltage.
b. current.
c. power.
d. energy.
45. A
15-mF
capacitor is connected to a 50-V battery and becomes fully charged.
The battery is removed and a slab of dielectric that completely fills the
space between the plates is inserted. If
the dielectric has a dielectric constant of 5, what is the capacitance of the
capacitor after the slab is inserted?
a. 75 mF
b. 20 mF
c. 3 mF
d. None of the
above
46. A
15-mF
capacitor is connected to a 50-V battery and becomes fully charged.
The battery is removed and a slab of dielectric that completely fills the
space between the plates is inserted. If
the dielectric has a dielectric constant of 5, what is the voltage across the
capacitor's plates after the slab is inserted?
a. 250 V
b. 10 V
c. 2 V
d. None of the
above
47.
Capacitors connected in series always have ____ total capacitance than
any of the individual capacities.
a) more
b) less
48. An
electron moving from the negative terminal to the positive terminal of a 12.
volt battery gains (or loses) how much energy?
Be sure to indicate whether it is a gain or loss.
a.
gains 12.eV (1.9ð10-19
J)
b.
Loses 15.eV (1.9ð10-19
J)
c.
Loses 12.eV (1.9ð10-19
J)
d.
gains 15.eV (1.9ð10-19
J)
49. An
electron volt is a unit of:
a. potential
b. charge
c. voltage
d. energy
50. A
negative charge, if free, tries to move
a. from high
potential to low potential
b. from low
potential to high potential
c. toward infinity
d. away from
infinity