Question 1

A series  RLCR L CRLC  circuit has a  100−Ω100 - \Omega100−Ω  resistor, a  0.100−μF0.100 - \mu \mathrm { F }0.100−μF  capacitor and a  2.00−mH2.00 - \mathrm { mH }2.00−mH  inductor connected across a 120-V rms ac voltage source operating at  1000/πHz1000 / \pi \mathrm { Hz }1000/πHz . What is the resonant frequency of this circuit?

Accepted Answer

A)    70.7kHz70.7 \mathrm { kHz }70.7kHz 
B)    17.9kHz17.9 \mathrm { kHz }17.9kHz 
C)    22.5kHz22.5 \mathrm { kHz }22.5kHz 
D)    11.3kHz11.3 \mathrm { kHz }11.3kHz 
E)    35.3kHz35.3 \mathrm { kHz }35.3kHzF) A) and B)
G) A) and D)

Question 2

Inductors cannot store energy because they cannot store charge.

Accepted Answer

A) True 
 B)False

Question 3

A group of  1.0−μF,2.0−μF1.0 - \mu \mathrm { F } , 2.0 - \mu \mathrm { F }1.0−μF,2.0−μF , and  3.0−μF3.0 - \mu \mathrm { F }3.0−μF  capacitors is connected in parallel across a  24−V24 - \mathrm { V }24−V  potential difference (a battery) . How much energy is stored in this three-capacitor combination when the capacitors are fully charged?

Accepted Answer

A)    2.1 mJ2.1 \mathrm {~mJ}2.1 mJ 
B)    1.7 mJ1.7 \mathrm {~mJ}1.7 mJ 
C)    4.8 mJ4.8 \mathrm {~mJ}4.8 mJ 
D)    7.1 mJ7.1 \mathrm {~mJ}7.1 mJE) A) and B)
F) None of the above

Question 4

A round flat conducting loop is placed perpendicular to a uniform  0.50 T0.50 \mathrm {~T}0.50 T  magnetic field. If the area of the loop increases at a rate of  3.0×10−3 m2/s3.0 	imes 10 ^ { - 3 } \mathrm {~m} ^ { 2 } / \mathrm { s }3.0×10−3 m2/s , what is the induced emf in the loop?

Accepted Answer

A)    4.3mV4.3 \mathrm { mV }4.3mV 
B)    0mV0 \mathrm { mV }0mV 
C)    5.5mV5.5 \mathrm { mV }5.5mV 
D)    1.7mV1.7 \mathrm { mV }1.7mV 
E)    1.5mV1.5 \mathrm { mV }1.5mVF) B) and C)
G) A) and E)

Question 5

A 9-V battery is hooked up to two resistors in series using wires of negligible resistance. One has a resistance of  5Ω5 \Omega5Ω , and the other has a resistance of  10Ω10 \Omega10Ω . Several locations along the circuit are marked with letters, as shown in the figure. Which statements about this circuit are true? (There could be more than one correct choice.)

Accepted Answer

A)   The current is exactly the same at points A, B, C, and D.
B)   The potential at  BBB  is equal to the potential at  CCC .
C)   The current at  AAA  is greater than the current at  BBB , which is equal to the current at  CCC , which is greater than the current at D.
D)   The potential at  DDD  is equal to the potential at  CCC .
E)   The current at  A\mathrm { A }A  is greater than the current at  B\mathrm { B }B , which is greater than the current at  C\mathrm { C }C , which is greater than the current at  DDD . F) B) and C)
G) A) and B)

Question 6

In the circuit shown in the figure, the  60−Hz60 - \mathrm { Hz }60−Hz  ac source has a voltage amplitude of  120 V120 \mathrm {~V}120 V , the capacitive reactance is  750Ω750 \Omega750Ω , the inductive reactance is  290Ω290 \Omega290Ω , and the resistance is  500Ω500 \Omega500Ω . What is the inductance  LLL  of the inductor?

Accepted Answer

A)    3700mH3700 \mathrm { mH }3700mH 
B)    1700mH1700 \mathrm { mH }1700mH 
C)    4800mH4800 \mathrm { mH }4800mH 
D)    2900mH2900 \mathrm { mH }2900mH 
E)    770mH770 \mathrm { mH }770mHF) B) and C)
G) A) and E)

Question 7

Two resistors with resistances of $5.0 \Omega$ and $9.0 \Omega$ are connected in parallel. A 4.0- $\Omega$ resistor is then connected in series with this parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination. What is the current through (a) the $4.0 - \Omega$ resistor and (b) the $5.0 - \Omega$ resistor?

Accepted Answer

(a) 0.83 A...

Question 8

A flat rectangular coil with dimensions of  8.0 cm×10 cm8.0 \mathrm {~cm} 	imes 10 \mathrm {~cm}8.0 cm×10 cm  is dropped from a zero magnetic field position into a 1.4-T magnetic field in  0.10 s0.10 \mathrm {~s}0.10 s . The coil has 60 turns and is perpendicular to the magnetic field. What is the average induced emf in the coil as a result of this action?

Accepted Answer

A)    3.6 V3.6 \mathrm {~V}3.6 V 
B)    6.7 V6.7 \mathrm {~V}6.7 V 
C)    2.4 V2.4 \mathrm {~V}2.4 V 
D)    0 V0 \mathrm {~V}0 V 
E)    8.6 V8.6 \mathrm {~V}8.6 VF) A) and C)
G) A) and B)

Question 9

A galvanometer with a coil resistance of  40.0Ω40.0 \Omega40.0Ω  deflects full scale for a current of  2.0 mA2.0 \mathrm {~mA}2.0 mA . What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for  50 V50 \mathrm {~V}50 V  ?

Accepted Answer

A)    27kΩ27 \mathrm { k } \Omega27kΩ 
B)    29kΩ29 \mathrm { k } \Omega29kΩ 
C)    31kΩ31 \mathrm { k } \Omega31kΩ 
D)    25kΩ25 \mathrm { k } \Omega25kΩE) A) and B)
F) A) and C)

Question 10

A  120−V120 - \mathrm { V }120−V  rms signal at  60.0 Hz60.0 \mathrm {~Hz}60.0 Hz  is applied across a series combination of a  30.0−mH30.0 - \mathrm { mH }30.0−mH  inductor and a resistor. If the rms value of the current in this circuit is  0.600 A0.600 \mathrm {~A}0.600 A , what is the resistance of the resistor?

Accepted Answer

A)    143Ω143 \Omega143Ω 
B)    30.0Ω30.0 \Omega30.0Ω 
C)    200Ω200 \Omega200Ω 
D)    80.0Ω80.0 \Omega80.0Ω 
E)    268Ω268 \Omega268ΩF) A) and B)
G) None of the above

Question 11

The impedance of an  RCR CRC  circuit containing a  40.0−μF40.0 - \mu \mathrm { F }40.0−μF  capacitor is  800Ω800 \Omega800Ω . If the frequency of the applied ac voltage is  18.0 Hz18.0 \mathrm {~Hz}18.0 Hz , what is the resistance of the resistor?

Accepted Answer

A)    769Ω769 \Omega769Ω 
B)    800Ω800 \Omega800Ω 
C)    569Ω569 \Omega569Ω 
D)    669Ω669 \Omega669Ω 
E)    869Ω869 \Omega869ΩF) A) and D)
G) None of the above

Question 12

Identical ideal batteries are connected in different arrangements to the same light bulb, as shown in the figure. For which arrangement will the bulb shine the brightest?

Accepted Answer

A)    A\mathrm { A }A 
B)    BBB 
C)    C\mathrm { C }CD) All of the above
E) A) and C)

Question 13

An ideal solenoid has a self-inductance  LLL . If you now double its radius and its length, but do not change the number of coils, what will its self-inductance be?

Accepted Answer

A)    LLL 
B)    L/4L / 4L/4 
C)    4L4 L4L 
D)    L/2L / 2L/2 
E)    2L2 L2LF) A) and E)
G) C) and D)

Question 14

The power factor of an ac  RLR LRL  circuit with a  100−Ω100 - \Omega100−Ω  resistor and a certain inductor is  0.600.600.60 . What is the impedance of the circuit?

Accepted Answer

A)    100Ω100 \Omega100Ω 
B)    170Ω170 \Omega170Ω 
C)    85Ω85 \Omega85Ω 
D)    340Ω340 \Omega340Ω 
E)    60Ω60 \Omega60ΩF) C) and E)
G) None of the above

Question 15

A galvanometer has a coil with a resistance of  24.0Ω24.0 \Omega24.0Ω , and a current of  180μA180 \mu \mathrm { A }180μA  causes full-scale deflection. If the galvanometer is to be used to construct an ammeter that deflects full scale for  10.0 A10.0 \mathrm {~A}10.0 A , what shunt resistor is required?

Accepted Answer

A)    423μΩ423 \mu \Omega423μΩ 
B)    432μΩ432 \mu \Omega432μΩ 
C)    234μΩ234 \mu \Omega234μΩ 
D)    342μΩ342 \mu \Omega342μΩE) None of the above
F) B) and C)

Question 16

A circular conducting loop with a radius of  0.50 m0.50 \mathrm {~m}0.50 m  and a small gap filled with a  10.0−Ω10.0 - \Omega10.0−Ω  resistor is oriented in the  xyx yxy -plane. If a uniform magnetic field of  1.0 T1.0 \mathrm {~T}1.0 T , making an angle of  30∘30 ^ { \circ }30∘  with the  zzz -axis, increases to  10.0 T10.0 \mathrm {~T}10.0 T , in  4.0 s4.0 \mathrm {~s}4.0 s , what is the magnitude of the current that will be caused to flow in the loop if it has negligible resistance?

Accepted Answer

A)    0 A0 \mathrm {~A}0 A 
B)    0.01530393 A0.01530393 \mathrm {~A}0.01530393 A 
C)    0.15303932 A0.15303932 \mathrm {~A}0.15303932 A 
D)    0.08835729 A0.08835729 \mathrm {~A}0.08835729 AE) C) and D)
F) A) and D)

Question 17

As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field  BBB  is present directed to the right. The bar is moving upward with velocity of magnitude  vvv . What is the polarity of the induced emf in terminals  XXX  and  YYY  ?

Accepted Answer

A)    YYY  is positive and  XXX  is negative.
B)    XXX  is positive and  YYY  is negative.
C)    XXX  and  YYY  are at the same potential. D) None of the above
E) All of the above

Question 18

In the circuit shown in the figure, the resistor  RRR  has a variable resistance. As  RRR  is decreased, what happens to the currents?

Accepted Answer

A)    I1I _ { 1 }I1​  decreases and  I2I _ { 2 }I2​  increases.
B)    I1I _ { 1 }I1​  increases and  I2I _ { 2 }I2​  decreases.
C)    I1I _ { 1 }I1​  decreases and  I2I _ { 2 }I2​  decreases.
D)    I1I _ { 1 }I1​  remains unchanged and  I2I _ { 2 }I2​  increases.
E)    I1I _ { 1 }I1​  increases and  I2I _ { 2 }I2​  increases. F) A) and E)
G) C) and D)

Question 19

The mutual inductance between two coils is 10 mH. The current in the first coil changes
uniformly from 2.7 A to 5.0 A in 160 ms. If the second coil has a resistance of 0.60 Ω, what
is the magnitude of the induced current in the second coil?

Accepted Answer

The answer of The mutual inductance between two coils is...

Question 20

A  60.0−μF60.0 - \mu \mathrm { F }60.0−μF  capacitor is in series with a  100−Ω100 - \Omega100−Ω  resistor connected across an ac source of frequency  120 Hz120 \mathrm {~Hz}120 Hz . What is the phase angle?

Accepted Answer

A)    −77.6∘- 77.6 ^ { \circ }−77.6∘ 
B)    −12.5∘- 12.5 ^ { \circ }−12.5∘ 
C)    +12.5∘+ 12.5 ^ { \circ }+12.5∘ 
D)    90.0∘90.0 ^ { \circ }90.0∘ 
E)    +77.6∘+ 77.6 ^ { \circ }+77.6∘F) A) and D)
G) B) and E)

Exam 19: Dc Circuits

A galvanometer has a coil with a resistance of $24.0 \Omega$ , and a current of $180 \mu \mathrm { A }$ causes full-scale deflection. If the galvanometer is to be used to construct an ammeter that deflects full scale for $10.0 \mathrm {~A}$ , what shunt resistor is required?

Correct Answer
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The power factor of an ac $R L$ circuit with a $100 - \Omega$ resistor and a certain inductor is $0.60$ . What is the impedance of the circuit?

Correct Answer
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Correct Answer
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Correct Answer
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The mutual inductance between two coils is 10 mH. The current in the first coil changes uniformly from 2.7 A to 5.0 A in 160 ms. If the second coil has a resistance of 0.60 Ω, what is the magnitude of the induced current in the second coil?

Correct Answer
verified

Inductors cannot store energy because they cannot store charge.

Correct Answer
verified

As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field $B$ is present directed to the right. The bar is moving upward with velocity of magnitude $v$ . What is the polarity of the induced emf in terminals $X$ and $Y$ ?

Correct Answer
verified

A series $R L C$ circuit has a $100 - \Omega$ resistor, a $0.100 - \mu \mathrm { F }$ capacitor and a $2.00 - \mathrm { mH }$ inductor connected across a 120-V rms ac voltage source operating at $1000 / \pi \mathrm { Hz }$ . What is the resonant frequency of this circuit?

Correct Answer
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Correct Answer
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A round flat conducting loop is placed perpendicular to a uniform $0.50 \mathrm {~T}$ magnetic field. If the area of the loop increases at a rate of $3.0 \times 10 ^ { - 3 } \mathrm {~m} ^ { 2 } / \mathrm { s }$ , what is the induced emf in the loop?

Correct Answer
verified

An ideal solenoid has a self-inductance $L$ . If you now double its radius and its length, but do not change the number of coils, what will its self-inductance be?

Correct Answer
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Correct Answer
verified
(a) 0.83 A...
View Answer

Correct Answer
verified

A group of $1.0 - \mu \mathrm { F } , 2.0 - \mu \mathrm { F }$ , and $3.0 - \mu \mathrm { F }$ capacitors is connected in parallel across a $24 - \mathrm { V }$ potential difference (a battery) . How much energy is stored in this three-capacitor combination when the capacitors are fully charged?

Correct Answer
verified

Correct Answer
verified

A galvanometer with a coil resistance of $40.0 \Omega$ deflects full scale for a current of $2.0 \mathrm {~mA}$ . What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for $50 \mathrm {~V}$ ?

Correct Answer
verified

The impedance of an $R C$ circuit containing a $40.0 - \mu \mathrm { F }$ capacitor is $800 \Omega$ . If the frequency of the applied ac voltage is $18.0 \mathrm {~Hz}$ , what is the resistance of the resistor?

Correct Answer
verified

Correct Answer
verified

A $60.0 - \mu \mathrm { F }$ capacitor is in series with a $100 - \Omega$ resistor connected across an ac source of frequency $120 \mathrm {~Hz}$ . What is the phase angle?

Correct Answer
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A $120 - \mathrm { V }$ rms signal at $60.0 \mathrm {~Hz}$ is applied across a series combination of a $30.0 - \mathrm { mH }$ inductor and a resistor. If the rms value of the current in this circuit is $0.600 \mathrm {~A}$ , what is the resistance of the resistor?

Correct Answer
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Exam 19: Dc Circuits

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The power factor of an ac RLR LRL circuit with a 100−Ω100 - \Omega100−Ω resistor and a certain inductor is 0.600.600.60 . What is the impedance of the circuit?

Correct AnswerverifiedShow Answer

Identical ideal batteries are connected in different arrangements to the same light bulb, as shown in the figure. For which arrangement will the bulb shine the brightest?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The mutual inductance between two coils is 10 mH. The current in the first coil changes uniformly from 2.7 A to 5.0 A in 160 ms. If the second coil has a resistance of 0.60 Ω, what is the magnitude of the induced current in the second coil?

Correct AnswerverifiedShow Answer

Inductors cannot store energy because they cannot store charge.

Correct AnswerverifiedShow Answer

As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field BBB is present directed to the right. The bar is moving upward with velocity of magnitude vvv . What is the polarity of the induced emf in terminals XXX and YYY ?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In the circuit shown in the figure, the resistor RRR has a variable resistance. As RRR is decreased, what happens to the currents?

Correct AnswerverifiedShow Answer

A round flat conducting loop is placed perpendicular to a uniform 0.50 T0.50 \mathrm {~T}0.50 T magnetic field. If the area of the loop increases at a rate of 3.0×10−3 m2/s3.0 \times 10 ^ { - 3 } \mathrm {~m} ^ { 2 } / \mathrm { s }3.0×10−3 m2/s , what is the induced emf in the loop?

Correct AnswerverifiedShow Answer

An ideal solenoid has a self-inductance LLL . If you now double its radius and its length, but do not change the number of coils, what will its self-inductance be?

Correct AnswerverifiedShow Answer

Correct Answerverified(a) 0.83 A...View AnswerShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A galvanometer with a coil resistance of 40.0Ω40.0 \Omega40.0Ω deflects full scale for a current of 2.0 mA2.0 \mathrm {~mA}2.0 mA . What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for 50 V50 \mathrm {~V}50 V ?

Correct AnswerverifiedShow Answer

The impedance of an RCR CRC circuit containing a 40.0−μF40.0 - \mu \mathrm { F }40.0−μF capacitor is 800Ω800 \Omega800Ω . If the frequency of the applied ac voltage is 18.0 Hz18.0 \mathrm {~Hz}18.0 Hz , what is the resistance of the resistor?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A 60.0−μF60.0 - \mu \mathrm { F }60.0−μF capacitor is in series with a 100−Ω100 - \Omega100−Ω resistor connected across an ac source of frequency 120 Hz120 \mathrm {~Hz}120 Hz . What is the phase angle?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

The power factor of an ac $R L$ circuit with a $100 - \Omega$ resistor and a certain inductor is $0.60$ . What is the impedance of the circuit?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

As shown in the figure, a metal bar is in contact with a pair of parallel rails. A steady, uniform, magnetic field $B$ is present directed to the right. The bar is moving upward with velocity of magnitude $v$ . What is the polarity of the induced emf in terminals $X$ and $Y$ ?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A round flat conducting loop is placed perpendicular to a uniform $0.50 \mathrm {~T}$ magnetic field. If the area of the loop increases at a rate of $3.0 \times 10 ^ { - 3 } \mathrm {~m} ^ { 2 } / \mathrm { s }$ , what is the induced emf in the loop?

Correct Answer
verified

An ideal solenoid has a self-inductance $L$ . If you now double its radius and its length, but do not change the number of coils, what will its self-inductance be?

Correct Answer
verified

Correct Answer
verified
(a) 0.83 A...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

A galvanometer with a coil resistance of $40.0 \Omega$ deflects full scale for a current of $2.0 \mathrm {~mA}$ . What series resistance should be used with this galvanometer in order to construct a voltmeter that deflects full scale for $50 \mathrm {~V}$ ?

Correct Answer
verified

The impedance of an $R C$ circuit containing a $40.0 - \mu \mathrm { F }$ capacitor is $800 \Omega$ . If the frequency of the applied ac voltage is $18.0 \mathrm {~Hz}$ , what is the resistance of the resistor?

Correct Answer
verified

Correct Answer
verified

A $60.0 - \mu \mathrm { F }$ capacitor is in series with a $100 - \Omega$ resistor connected across an ac source of frequency $120 \mathrm {~Hz}$ . What is the phase angle?

Correct Answer
verified

Correct Answer
verified