Question 1

An ac generator producing 10 V (rms) at 200 rad/s is connected in series with a 50- Ω\OmegaΩ  resistor, a 400-mH inductor, and a 200- μ\muμ F capacitor.The rms voltage across the capacitor is:

Accepted Answer

A)  2.5 V
B)  3.4 V
C)  6.7 V
D)  10.0 V
E)  10.8 V F) C) and E)
G) All of the above

Question 2

An RLC series circuit, connected to a source , is at resonance.Then:

Accepted Answer

A)  the voltage across R is zero
B)  the voltage across R equals the applied voltage
C)  the voltage across C is zero
D)  the voltage across L equals the applied voltage
E)  the applied voltage and current differ in phase by 90   °\degree°F) A) and E)
G) D) and E)

Question 3

An LC circuit has an inductance of 15 mH and a capacitance of 10  μ\muμ F.At one instant the charge on the capacitor is 25  μ\muμ C.At that instant the current is changing at the rate:

Accepted Answer

A)  0 A/s
B)  1.7 * 10-7 A/s
C)  5.9 * 10-3 A/s
D)  3.8 * 10-2 A/s
E)  170 A/s F) C) and D)
G) C) and E)

Question 4

A 35- μ\muμ F capacitor is connected to an ac source of emf with a frequency of 250 Hz and a maximum emf of 20 V.If the voltage across the capacitor is zero at time t = 0, what is the voltage at time t = 3.0 ms? Assume the phase constant is zero.

Accepted Answer

A)  −20 V
B)  −10 V
C)  0 V
D)  10 V
E)  20 V F) All of the above
G) A) and B)

Question 5

A series circuit consists of a 15- Ω\OmegaΩ  resistor, a 25-mH inductor, and a 35- μ\muμ F capacitor.If the frequency is 100 Hz the power factor is:

Accepted Answer

A)  0
B)  0.20
C)  0.45
D)  0.65
E)  1.0 F) B) and E)
G) A) and B)

Question 6

In the diagram, the function y(t) = ymsin( ω \omega ω t) is plotted as a solid curve.The other three curves have the form y(t) = ymsin( ω \omega ω t +  ϕ\phiϕ ) , where  ϕ\phiϕ  is between -  π\piπ /2 and +  π\piπ /2.Rank the curves according to the value of  ϕ\phiϕ , from the most negative to the most positive. msin(  \omega  t) is plotted as a solid curve.The other three curves have the form y(t) = ymsin(  \omega  t +  \phi ) , where  \phi  is between -  \pi /2 and +  \pi /2.Rank the curves according to the value of  \phi , from the most negative to the most positive.   A) 1, 2, 3 B) 2, 3, 1 C) 3, 2, 1 D) 1, 3, 2 E) 2, 1, 3 " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  1, 2, 3
B)  2, 3, 1
C)  3, 2, 1
D)  1, 3, 2
E)  2, 1, 3 F) D) and E)
G) C) and E)

Exam 31: Electromagnetic Oscillations and Alternating Current

A 35- $\mu$ F capacitor is connected to an ac source of emf with a frequency of 250 Hz and a maximum emf of 20 V.If the voltage across the capacitor is zero at time t = 0, what is the voltage at time t = 3.0 ms? Assume the phase constant is zero.

Correct Answer
verified

An RLC series circuit, connected to a source , is at resonance.Then:

Correct Answer
verified

A series circuit consists of a 15- $\Omega$ resistor, a 25-mH inductor, and a 35- $\mu$ F capacitor.If the frequency is 100 Hz the power factor is:

Correct Answer
verified

Correct Answer
verified

An ac generator producing 10 V (rms) at 200 rad/s is connected in series with a 50- $\Omega$ resistor, a 400-mH inductor, and a 200- $\mu$ F capacitor.The rms voltage across the capacitor is:

Correct Answer
verified

An LC circuit has an inductance of 15 mH and a capacitance of 10 $\mu$ F.At one instant the charge on the capacitor is 25 $\mu$ C.At that instant the current is changing at the rate:

Correct Answer
verified

Exam 31: Electromagnetic Oscillations and Alternating Current

A 35- μ\muμ F capacitor is connected to an ac source of emf with a frequency of 250 Hz and a maximum emf of 20 V.If the voltage across the capacitor is zero at time t = 0, what is the voltage at time t = 3.0 ms? Assume the phase constant is zero.

Correct AnswerverifiedShow Answer

An RLC series circuit, connected to a source , is at resonance.Then:

Correct AnswerverifiedShow Answer

A series circuit consists of a 15- Ω\OmegaΩ resistor, a 25-mH inductor, and a 35- μ\muμ F capacitor.If the frequency is 100 Hz the power factor is:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

An ac generator producing 10 V (rms) at 200 rad/s is connected in series with a 50- Ω\OmegaΩ resistor, a 400-mH inductor, and a 200- μ\muμ F capacitor.The rms voltage across the capacitor is:

Correct AnswerverifiedShow Answer

An LC circuit has an inductance of 15 mH and a capacitance of 10 μ\muμ F.At one instant the charge on the capacitor is 25 μ\muμ C.At that instant the current is changing at the rate:

Correct AnswerverifiedShow Answer

A 35- $\mu$ F capacitor is connected to an ac source of emf with a frequency of 250 Hz and a maximum emf of 20 V.If the voltage across the capacitor is zero at time t = 0, what is the voltage at time t = 3.0 ms? Assume the phase constant is zero.

Correct Answer
verified

Correct Answer
verified

A series circuit consists of a 15- $\Omega$ resistor, a 25-mH inductor, and a 35- $\mu$ F capacitor.If the frequency is 100 Hz the power factor is:

Correct Answer
verified

Correct Answer
verified

An ac generator producing 10 V (rms) at 200 rad/s is connected in series with a 50- $\Omega$ resistor, a 400-mH inductor, and a 200- $\mu$ F capacitor.The rms voltage across the capacitor is:

Correct Answer
verified

An LC circuit has an inductance of 15 mH and a capacitance of 10 $\mu$ F.At one instant the charge on the capacitor is 25 $\mu$ C.At that instant the current is changing at the rate:

Correct Answer
verified