Question 1

What is the inductance of a series RL circuit in which R = 1.0 K  Ω\OmegaΩ   if the current increases to one-third of its final value in 30  μ\muμ s?

Accepted Answer

A)  74 mH
B)  99 mH
C)  49 mH
D)  62 mH
E)  none of the above F) B) and D)
G) B) and E)

Question 2

A circuit contains two inductors of 6.0 mH inductance in series placed in parallel with an inductor of 8.0 mH inductance.After one of the 6.0 mH inductors burns out, the repair person wants to replace all three inductors with one inductor of equivalent inductance.Assuming inductors combine in series and parallel the same way resistors do, what inductance should she use?

Accepted Answer

A)  3.0 mH
B)  3.4 mH
C)  4.8 mH
D)  11 mH
E)  20 mHF) D) and E)
G) A) and B)

Question 3

A circuit contains two inductors of 6.0 mH inductance in parallel placed in series with an inductor of 8.0 mH inductance.After one of the 6.0 mH inductors burns out, the repairman wants to replace all three inductors with one inductor of equivalent inductance.Assuming inductors combine in series and parallel the same way resistors do, what inductance should he use?

Accepted Answer

A)  3.0 mH
B)  3.4 mH
C)  4.8 mH
D)  11 mH
E)  20 mHF) B) and E)
G) A) and C)

Question 4

When a switch is closed to complete a DC series RL circuit:

Accepted Answer

A)  the electric field in the wires increases to a maximum value.
B)  the magnetic field outside the wires increases to a maximum value.
C)  the rate of change of the electric and magnetic fields is greatest at the instant when the switch is closed.
D)  all of the above are true.
E)  only (a)  and (c)  above are true.F) None of the above
G) D) and E)

Question 5

When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants.

Accepted Answer

A)  0.500
B)  0.693
C)  0.725
D)  1.33
E)  1.39F) A) and C)
G) A) and E)

Question 6

A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery.The angular frequency of the electromagnetic oscillations in the circuit is:

Accepted Answer

A)  36.0 * 10-4 rad/s.
B)  6.00 * 10-2 rad/s.
C)  2.78 rad/s.
D)  16.7 rad/s.
E)  277 rad/s.F) B) and C)
G) A) and C)

Question 7

A 10-mH inductor is connected in series with a 10-ohm resistor, a switch and a 6-volt battery.What is the time constant of the circuit? How long after the switch is closed will the current reach 99 per cent of its final value?

Accepted Answer

The answer of A 10-mH inductor is connected in series...

Question 8

A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery.The frequency of the electromagnetic oscillations in the circuit is:

Accepted Answer

A)  5.73 *-4 Hz.
B)  9.55 * 10-3 Hz.
C)  0.442 Hz.
D)  2.65 Hz.
E)  44.0 Hz.F) D) and E)
G) B) and C)

Question 9

Before the switch is closed in the figure, the potential across the capacitor is 200 V.At some instant after the switch is closed, the instantaneous current is 0.70 A.What is the energy in the capacitor at this instant?

Accepted Answer

A)  49 mJ
B)  31 mJ
C)  80 mJ
D)  0.13 J
E)  62 mJF) B) and D)
G) B) and C)

Question 10

An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed.We can explain this by:

Accepted Answer

A)  Lenz's law.
B)  increasing magnetic flux within the coils of the inductor.
C)  increasing current in the coils of the inductor.
D)  all of the above.
E)  only (a)  and (c)  above.F) All of the above
G) D) and E) D

Question 11

Coaxial Cable A has twice the length, twice the radius of the inner solid conductor, and twice the radius of the outer cylindrical conducting shell of coaxial Cable B.What is the ratio of the inductance of Cable A to that of Cable B?

Accepted Answer

A)   
B)   
C)  2
D)   
E)   F) A) and B)
G) B) and C)

Question 12

The switch in the figure is closed at t = 0 when the current I is zero.When I = 15 mA, what is the potential difference across the inductor?

Accepted Answer

A)  240 V
B)  60 V
C)  0
D)  180 V
E)  190 VF) A) and B)
G) A) and E)

Question 13

If we wished to construct a 'tank circuit' where electric charge originally stored on a capacitor flows through an inductor, then back again, what value of inductance should we place in series with a fully-charged 100 $\mu$0F capacitor to get the circuit to resonate at 60.0 Hz?

Accepted Answer

70.4 mH

Question 14

The figure shows an LR circuit with a switch and a 240-volt battery.At the instant the switch is closed the current in the circuit and the potential difference between points a and b, Vab, are:

Accepted Answer

A)  0 A, 0 V
B)  0 A, -240 V
C)  0 A, +240 V
D)  0.024 A, 0 V
E)  0.024 A, +240 VF) None of the above
G) C) and E)

Question 15

The magnetic field in a superconducting solenoid is 3.0 T.How much energy per unit volume is stored in the solenoid, in J/m3? $\mu$0 = 4 $\pi$ *10-07 T .A/m

Accepted Answer

The answer of The magnetic field in a superconducting solenoid...

Question 16

When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants.

Accepted Answer

A)  0.250
B)  0.500
C)  0.693
D)  1.00
E)  1.44F) A) and E)
G) C) and E)

Question 17

For the circuit shown, what is the rate of change of the current in the inductor when the current in the battery is 0.50 A?

Accepted Answer

A)  600 A/s
B)  400 A/s
C)  200 A/s
D)  800 A/s
E)  500 A/sF) A) and B)
G) D) and E)

Question 18

An RLC circuit has L = 250 mH, C = 0.200 $\mu$F, and R = 2.00 k $\Omega$.What is the angular frequency of its damped oscillations?

Accepted Answer

The answer of An RLC circuit has L = 250...

Question 19

Which of the following are the units of a henry and a farad respectively?

Accepted Answer

A)  J . s2/C2 and C2/J
B)  V . s/A and V/C
C)  V/(A . s)  and C/V
D)  N .m/A2 and 1/J
E)  None of the aboveF) All of the above
G) B) and D) A

Question 20

There is no current in the circuit shown in the figure below until the switch is closed.The current through the 20-  Ω\OmegaΩ  resistor the instant after the switch is closed is either [1] 15 A or [2] 5.0 A, and the current through the 20-  Ω\OmegaΩ  resistor after the switch has been closed a long time is either [3] 5.0 A or [4] 15 A.Which combination of the above choices is correct?

Accepted Answer

A)  [1] and [3]
B)  [1] and [4]
C)  [2] and [3]
D)  [2] and [4]
E)  None of these F) A) and D)
G) A) and B)

Exam 10: Inductance

What is the inductance of a series RL circuit in which R = 1.0 K $\Omega$ if the current increases to one-third of its final value in 30 $\mu$ s?

Correct Answer
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Correct Answer
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When a switch is closed to complete a DC series RL circuit:

Correct Answer
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When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants.

Correct Answer
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A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery.The angular frequency of the electromagnetic oscillations in the circuit is:

Correct Answer
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A 10-mH inductor is connected in series with a 10-ohm resistor, a switch and a 6-volt battery.What is the time constant of the circuit? How long after the switch is closed will the current reach 99 per cent of its final value?

Correct Answer
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A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery.The frequency of the electromagnetic oscillations in the circuit is:

Correct Answer
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Before the switch is closed in the figure, the potential across the capacitor is 200 V.At some instant after the switch is closed, the instantaneous current is 0.70 A.What is the energy in the capacitor at this instant?

Correct Answer
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An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed.We can explain this by:

Correct Answer
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D

Coaxial Cable A has twice the length, twice the radius of the inner solid conductor, and twice the radius of the outer cylindrical conducting shell of coaxial Cable B.What is the ratio of the inductance of Cable A to that of Cable B?

Correct Answer
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The switch in the figure is closed at t = 0 when the current I is zero.When I = 15 mA, what is the potential difference across the inductor?

Correct Answer
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If we wished to construct a 'tank circuit' where electric charge originally stored on a capacitor flows through an inductor, then back again, what value of inductance should we place in series with a fully-charged 100 $\mu$ 0F capacitor to get the circuit to resonate at 60.0 Hz?

Correct Answer
verified
70.4 mH

The figure shows an LR circuit with a switch and a 240-volt battery.At the instant the switch is closed the current in the circuit and the potential difference between points a and b, Vab, are:

Correct Answer
verified

The magnetic field in a superconducting solenoid is 3.0 T.How much energy per unit volume is stored in the solenoid, in J/m3? $\mu$ 0 = 4 $\pi$ *10-07 T .A/m

Correct Answer
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When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants.

Correct Answer
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For the circuit shown, what is the rate of change of the current in the inductor when the current in the battery is 0.50 A?

Correct Answer
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An RLC circuit has L = 250 mH, C = 0.200 $\mu$ F, and R = 2.00 k $\Omega$ .What is the angular frequency of its damped oscillations?

Correct Answer
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Which of the following are the units of a henry and a farad respectively?

Correct Answer
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A

Correct Answer
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Exam 10: Inductance

What is the inductance of a series RL circuit in which R = 1.0 K Ω\OmegaΩ if the current increases to one-third of its final value in 30 μ\muμ s?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When a switch is closed to complete a DC series RL circuit:

Correct AnswerverifiedShow Answer

When a switch is closed, completing an LR series circuit, the time needed for the current to reach three-quarters its maximum value is ____ time constants.

Correct AnswerverifiedShow Answer

A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery.The angular frequency of the electromagnetic oscillations in the circuit is:

Correct AnswerverifiedShow Answer

A 10-mH inductor is connected in series with a 10-ohm resistor, a switch and a 6-volt battery.What is the time constant of the circuit? How long after the switch is closed will the current reach 99 per cent of its final value?

Correct AnswerverifiedShow Answer

A series LC circuit contains a 100 mH inductor, a 36.0 mF capacitor and a 12 V battery.The frequency of the electromagnetic oscillations in the circuit is:

Correct AnswerverifiedShow Answer

Before the switch is closed in the figure, the potential across the capacitor is 200 V.At some instant after the switch is closed, the instantaneous current is 0.70 A.What is the energy in the capacitor at this instant?

Correct AnswerverifiedShow Answer

An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed.We can explain this by:

Correct AnswerverifiedD

Coaxial Cable A has twice the length, twice the radius of the inner solid conductor, and twice the radius of the outer cylindrical conducting shell of coaxial Cable B.What is the ratio of the inductance of Cable A to that of Cable B?

Correct AnswerverifiedShow Answer

The switch in the figure is closed at t = 0 when the current I is zero.When I = 15 mA, what is the potential difference across the inductor?

Correct AnswerverifiedShow Answer

If we wished to construct a 'tank circuit' where electric charge originally stored on a capacitor flows through an inductor, then back again, what value of inductance should we place in series with a fully-charged 100 μ\muμ 0F capacitor to get the circuit to resonate at 60.0 Hz?

Correct Answerverified70.4 mH

The figure shows an LR circuit with a switch and a 240-volt battery.At the instant the switch is closed the current in the circuit and the potential difference between points a and b, Vab, are:

Correct AnswerverifiedShow Answer

The magnetic field in a superconducting solenoid is 3.0 T.How much energy per unit volume is stored in the solenoid, in J/m3? μ\muμ 0 = 4 π\piπ *10-07 T .A/m

Correct AnswerverifiedShow Answer

When a switch is closed, completing an LR series circuit, the time needed for the current to reach one half its maximum value is ____ time constants.

Correct AnswerverifiedShow Answer

For the circuit shown, what is the rate of change of the current in the inductor when the current in the battery is 0.50 A?

Correct AnswerverifiedShow Answer

An RLC circuit has L = 250 mH, C = 0.200 μ\muμ F, and R = 2.00 k Ω\OmegaΩ .What is the angular frequency of its damped oscillations?

Correct AnswerverifiedShow Answer

Which of the following are the units of a henry and a farad respectively?

Correct AnswerverifiedA

Correct AnswerverifiedShow Answer

What is the inductance of a series RL circuit in which R = 1.0 K $\Omega$ if the current increases to one-third of its final value in 30 $\mu$ s?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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D

Correct Answer
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Correct Answer
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If we wished to construct a 'tank circuit' where electric charge originally stored on a capacitor flows through an inductor, then back again, what value of inductance should we place in series with a fully-charged 100 $\mu$ 0F capacitor to get the circuit to resonate at 60.0 Hz?

Correct Answer
verified
70.4 mH

Correct Answer
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The magnetic field in a superconducting solenoid is 3.0 T.How much energy per unit volume is stored in the solenoid, in J/m3? $\mu$ 0 = 4 $\pi$ *10-07 T .A/m

Correct Answer
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Correct Answer
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Correct Answer
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An RLC circuit has L = 250 mH, C = 0.200 $\mu$ F, and R = 2.00 k $\Omega$ .What is the angular frequency of its damped oscillations?

Correct Answer
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Correct Answer
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A

Correct Answer
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