Quiz 10 – 2015.02.04

Report
The energy stored in a parallel plate
capacitor is
0%
of
th
e
ab
o
ab
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ve
ve
0%
no
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ft
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½
ve
ea
th
to
ua
l
eq
lo
r. .
eq
ui
kr
or
ew
th
to
ua
l
eq
0%
po
t. .
.
0%
CV
2
0%
al
A. equal to the work
required to charge it
B. ½ CV2
C. equal to the average
potential difference
multiplied by the
final charge
D. all of the above
E. none of the above
Energy can be stored in a vacuum.
A. True
B. False
se
0%
Fa
l
Tr
ue
0%
The capacitance of a capacitor of a given
dimension is _______ when there is a
dielectric material between the plates than
when there is air or vacuum.
A. greater
B. less
C. the same
sa
m
e
0%
th
e
ss
0%
le
gr
ea
te
r
0%
The potential across a capacitor of a given
dimension is _______ when there is a
dielectric material between the plates than
when there is air or vacuum.
A. greater
B. less
C. the same
sa
m
e
0%
th
e
ss
0%
le
gr
ea
te
r
0%
The charges on the plates of a capacitor of
a given dimension is _______ when there
is a dielectric material between the plates
than when there is air or vacuum.
A. greater
B. less
C. the same
sa
m
e
0%
th
e
ss
0%
le
gr
ea
te
r
0%
Due to dielectric breakdown, when a
dielectric material is subjected to a
sufficiently strong electric field, it
becomes a(n) ________.
A. Insulator
B. conductor
to
r
0%
co
nd
uc
In
su
l
at
or
0%
The plates of a parallel-plate capacitor are 2.50 mm
apart, each carrying a charge of magnitude 80.0 nC.
The plates are in a vacuum and the electric fields
between the plates has a magnitude of 4.00 x 106
V/m. What is the potential difference between the
plates (in V)?
Rank
Responses
1
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6
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0%
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0%
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0%
6
The plates of a parallel-plate capacitor are 2.50 mm
apart, each carrying a charge of magnitude 80.0 nC.
The plates are in a vacuum and the electric fields
between the plates has a magnitude of 4.00 x 106
V/m. What is the capacitance (in pF)?
Rank
Responses
1
2
3
4
5
6
0%
1
0%
2
0%
3
0%
4
0%
5
0%
6
A 12.5 μF capacitor is connected to a power supply that
keeps a constant potential difference of 24.0 V across
the plates. A piece of material having a dielectric
constant of 3.75 is placed between the plates, filling
the space. How much energy is stored in the capacitor
before the material was inserted (in mJ)?
Rank
1
2
3
4
5
6
Responses
0%
1
0%
2
0%
3
0%
4
0%
5
0%
6
A 12.5 μF capacitor is connected to a power supply that
keeps a constant potential difference of 24.0 V across
the plates. A piece of material having a dielectric
constant of 3.75 is placed between the plates, filling
the space. How much energy is stored in the capacitor
after the material was inserted (in mJ)?
Rank
1
2
3
4
5
6
Responses
0%
1
0%
2
0%
3
0%
4
0%
5
0%
6

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