Clicker Question
Right after switch S
is closed, what will
be the potential
difference across
the capacitor?
A) 0
B)
C)
D)
E)
ε
ε R2/(R1+ R2)
ε /2
ε R1/(R1+ R2)
Clicker Question
Right after switch S
is closed, what will
be the potential
difference across
the capacitor?
A) 0
B)
C)
D)
E)
ε
ε R2/(R1+ R2)
ε /2
ε R1/(R1+ R2)
Clicker Question
A long time after switch
S is closed, what will be
the charge on the
capacitor?
A) 0
B) Cε
C)
D)
ε/C
Cε /2
E) C/R2
Clicker Question
A long time after switch
S is closed, what will be
the charge on the
capacitor?
A) 0
B) Cε
C)
D)
ε/C
Cε /2
E) C/R2
Figure 30.15
Figure 30.14
Table 30.1
Clicker Question
An inductor (inductance L)
and a capacitor (capacitance
C) are connected as shown.
If the values of both L and C
are doubled, what happens
to the time required for the
capacitor charge to oscillate
through a complete cycle?
A. It becomes 4 times longer.
B. It becomes twice as long.
C. It is unchanged.
D. It becomes 1/2 as long.
E. It becomes 1/4 as long.
Clicker Question
An inductor (inductance L)
and a capacitor (capacitance
C) are connected as shown.
If the values of both L and C
are doubled, what happens
to the time required for the
capacitor charge to oscillate
through a complete cycle?
A. It becomes 4 times longer.
B. It becomes twice as long.
C. It is unchanged.
D. It becomes 1/2 as long.
E. It becomes 1/4 as long.
Clicker Question
An inductor (inductance L) and a
capacitor (capacitance C) are
connected as shown. The value of
the capacitor charge q oscillates
between positive and negative
values. At any instant, the
potential difference between the
capacitor plates is
A. proportional to q.
C. proportional to d2q/dt2.
E. all of A, B, and C.
B. proportional to dq/dt.
D. both A and C.
Clicker Question
An inductor (inductance L) and a
capacitor (capacitance C) are
connected as shown. The value of
the capacitor charge q oscillates
between positive and negative
values. At any instant, the
potential difference between the
capacitor plates is
A. proportional to q.
C. proportional to d2q/dt2.
E. all of A, B, and C.
B. proportional to dq/dt.
D. both A and C.
Clicker Question
Which phasor
shows current that
is positive and
increasing with
time?
Clicker Question
Which phasor
shows current that
is positive and
increasing with
time?
Clicker Question
Which phasor shows a
current that is negative
with an increasing
magnitude (i.e. getting
more negative?)
Clicker Question
Which phasor shows a
current that is negative
with an increasing
magnitude (i.e. getting
more negative?)
Clicker Question
A resistor is connected across an ac
source as shown. For this circuit,
what is the relationship between the
instantaneous current i through the
resistor and the instantaneous
voltage vab across the resistor?
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
Clicker Question
A resistor is connected across an ac
source as shown. For this circuit,
what is the relationship between the
instantaneous current i through the
resistor and the instantaneous
voltage vab across the resistor?
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
Clicker Question
An inductor is connected across an ac
source as shown. For this circuit,
what is the relationship between the
instantaneous current i through the
inductor and the instantaneous
voltage vab across the inductor?
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
Clicker Question
An inductor is connected across an ac
source as shown. For this circuit,
what is the relationship between the
instantaneous current i through the
inductor and the instantaneous
voltage vab across the inductor?
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
Clicker Question
A capacitor is connected across an ac
source as shown. For this circuit,
what is the relationship between the
instantaneous current i through the
capacitor and the instantaneous
voltage vab across the capacitor?
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
Clicker Question
A capacitor is connected across an ac
source as shown. For this circuit,
what is the relationship between the
instantaneous current i through the
capacitor and the instantaneous
voltage vab across the capacitor?
A. i is maximum at the same time as vab
B. i is maximum one-quarter cycle before vab
C. i is maximum one-quarter cycle after vab
D. not enough information given to decide
Clicker Question
An AC voltage source drives a sinusoidal current through
two resistors.
The amplitude of the sinusoidal voltage across the first
resistor is 4 V.
The amplitude of the sinusoidal voltage across the second
resistor is 3 V.
What is the amplitude of the sinusoidal voltage provided by
the source?
A) 0 V
B) 1 V
4Ω
C) 5 V
D) 7 V
E) 12 V
3Ω
Clicker Question
An AC voltage source drives a sinusoidal current through
two resistors.
The amplitude of the sinusoidal voltage across the first
resistor is 4 V.
The amplitude of the sinusoidal voltage across the second
resistor is 3 V.
What is the amplitude of the sinusoidal voltage provided by
the source?
A) 0 V
B) 1 V
4Ω
C) 5 V
D) 7 V
E) 12 V
3Ω
Clicker Question
An AC voltage source drives a sinusoidal current through a
resistor and an inductor in series.
The amplitude of the sinusoidal voltage across the resistor
is 4 V.
The amplitude of the sinusoidal voltage across the inductor
is 3 V.
What is the amplitude of the sinusoidal voltage provided by
the source?
A) 0 V
B) 1 V
4V
C) 5 V
D) 7 V
E) 12 V
3V
Clicker Question
An AC voltage source drives a sinusoidal current through a
resistor and an inductor in series.
The amplitude of the sinusoidal voltage across the resistor
is 4 V.
The amplitude of the sinusoidal voltage across the inductor
is 3 V.
What is the amplitude of the sinusoidal voltage provided by
the source?
A) 0 V
B) 1 V
4V
C) 5 V
D) 7 V
E) 12 V
3V
Clicker Question
An AC voltage source drives a sinusoidal current through a
capacitor and a resistor in series.
The amplitude of the sinusoidal voltage across the capacitor
is 4 V.
The amplitude of the sinusoidal voltage across the resistor
is 3 V.
What is the amplitude of the sinusoidal voltage provided by
the source?
A) 0 V
B) 1 V
C) 5 V
D) 7 V
E) 12 V
Clicker Question
An AC voltage source drives a sinusoidal current through a
capacitor and a resistor in series.
The amplitude of the sinusoidal voltage across the capacitor
is 4 V.
The amplitude of the sinusoidal voltage across the resistor
is 3 V.
What is the amplitude of the sinusoidal voltage provided by
the source?
A) 0 V
B) 1 V
C) 5 V
D) 7 V
E) 12 V
Clicker Question
An AC voltage source drives a sinusoidal current through a
capacitor and an inductor in series.
The amplitude of the sinusoidal voltage across the capacitor is 4 V.
The amplitude of the sinusoidal voltage across the inductor is 3 V.
What is the amplitude of the sinusoidal voltage provided by the
source?
A) 0 V
B) 1 V
C) 5 V
D) 7 V
E) 12 V
Clicker Question
An AC voltage source drives a sinusoidal current through a
capacitor and an inductor in series.
The amplitude of the sinusoidal voltage across the capacitor is 4 V.
The amplitude of the sinusoidal voltage across the inductor is 3 V.
What is the amplitude of the sinusoidal voltage provided by the
source?
A) 0 V
B) 1 V
C) 5 V
D) 7 V
E) 12 V
Clicker Question
An L-R-C series circuit as shown is operating at its resonant
frequency. At this frequency, how are the values of the capacitive
reactance XC, the inductive reactance XL, and the resistance R
related to each other?
A) XL = R; XC can have any value.
B) XC = R; XL can have any value.
C) XC = XL; R can have any value.
D) XC = XL = R.
E) none of the above
Clicker Question
An L-R-C series circuit as shown is operating at its resonant
frequency. At this frequency, how are the values of the capacitive
reactance XC, the inductive reactance XL, and the resistance R
related to each other?
A) XL = R; XC can have any value.
B) XC = R; XL can have any value.
C) XC = XL; R can have any value.
D) XC = XL = R.
E) none of the above
Clicker Question
In an L-R-C series circuit as shown, the current has a very small
amplitude if the ac source oscillates at a very high frequency.
Which circuit element causes this behavior?
A. the resistor R
B. the inductor L
C. the capacitor C
D. misleading question — the
current actually has a very
large amplitude if the
frequency is very high
Clicker Question
In an L-R-C series circuit as shown, the current has a very small
amplitude if the ac source oscillates at a very high frequency.
Which circuit element causes this behavior?
A. the resistor R
B. the inductor L
C. the capacitor C
D. misleading question — the
current actually has a very
large amplitude if the
frequency is very high
Clicker Question
In an L-R-C series circuit as shown, there is a phase angle
between the instantaneous current through the circuit
and the instantaneous voltage vad across the entire
circuit. For what value of the phase angle is the greatest
power delivered to the resistor?
A. zero
B. 90°
C. 180°
D. 270°
E. none of the above
Clicker Question
In an L-R-C series circuit as shown, there is a phase angle
between the instantaneous current through the circuit
and the instantaneous voltage vad across the entire
circuit. For what value of the phase angle is the greatest
power delivered to the resistor?
A. zero
B. 90°
C. 180°
D. 270°
E. none of the above
Clicker Question
In an L-R-C series circuit as
shown, suppose that the
angular frequency of the ac
source equals the resonance
angular frequency. In this
case, the circuit impedance
A. is maximum.
B. is minimum, but not zero.
C. is zero.
D. is neither a maximum nor a minimum.
E. not enough information give to decide
Clicker Question
In an L-R-C series circuit as
shown, suppose that the
angular frequency of the ac
source equals the resonance
angular frequency. In this
case, the circuit impedance
A. is maximum.
B. is minimum, but not zero.
C. is zero.
D. is neither a maximum nor a minimum.
E. not enough information give to decide