Question 1

For the circuit shown in the figure,what current does the ideal ammeter read?

Accepted Answer

A)  0.033 A 
B)  0.078 A 
C)  0.23 A 
D)  0.12 A 
A)  0.033 A 
B)  0.078 A 
C)  0.23 A 
D)  0.12 A

Question 2

A galvanometer coil having a resistance of 20 Ω and a full-scale deflection at 1.0 mA is connected in series with a 4980 Ω resistance to build a voltmeter.What is the maximum voltage that this voltmeter can read?

Accepted Answer

A)  3.0 V 
B)  1.0 V 
C)  50 V 
D)  5.0 V 
E)  10 V 
A)  3.0 V 
B)  1.0 V 
C)  50 V 
D)  5.0 V 
E)  10 V

Question 3

When four identical resistors are connected to an ideal battery of voltage V = 10 V as shown in the figure,the current I is equal to 0.20 A.What is the value of the resistance R of the resistors?

Accepted Answer

A)  20 Ω 
B)  40 Ω 
C)  30 Ω 
D)  50 Ω 
E)  10 Ω 
A)  20 Ω 
B)  40 Ω 
C)  30 Ω 
D)  50 Ω 
E)  10 Ω

Question 4

In the circuit shown in the figure,an ideal ohmmeter is connected across ab with the switch S open.All the connecting leads have negligible resistance.The reading of the ohmmeter will be closest to

Accepted Answer

A)  7.5 Ω. 
B)  10 Ω. 
C)  30 Ω. 
D)  40 Ω. 
E)  60 Ω. 
A)  7.5 Ω. 
B)  10 Ω. 
C)  30 Ω. 
D)  40 Ω. 
E)  60 Ω.

Question 5

For the circuit shown in the figure,all quantities are accurate to 3 significant figures.What is the power dissipated in the 2-Ω resistor?

Accepted Answer

A)  5.33 W 
B)  8.0 W 
C)  6.67 W 
D)  2.67 W 
E)  3.56 W 
A)  5.33 W 
B)  8.0 W 
C)  6.67 W 
D)  2.67 W 
E)  3.56 W

Question 6

An RC circuit is connected across an ideal DC voltage source through an open switch.The switch is closed at time t = 0 s.Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)

Accepted Answer

A)  The capacitor charges to its maximum value in one time constant and the current is zero at that time. 
B)  The potential difference across the resistor and the potential difference across the capacitor are always equal. 
C)  The potential difference across the resistor is always greater than the potential difference across the capacitor. 
D)  The potential difference across the capacitor is always greater than the potential difference across the resistor 
E)  Once the capacitor is essentially fully charged, there is no appreciable current in the circuit. 
A)  The capacitor charges to its maximum value in one time constant and the current is zero at that time. 
B)  The potential difference across the resistor and the potential difference across the capacitor are always equal. 
C)  The potential difference across the resistor is always greater than the potential difference across the capacitor. 
D)  The potential difference across the capacitor is always greater than the potential difference across the resistor 
E)  Once the capacitor is essentially fully charged, there is no appreciable current in the circuit.

Question 7

A light bulb is connected in the circuit shown in the figure with the switch S open.All the connecting leads have no appreciable resistance and the battery has no internal resistance.When we close the switch,which statements below accurately describe the behavior of the circuit? (There may be more than one correct choice.)

Accepted Answer

A)  The brightness of the bulb will increase. 
B)  The brightness of the bulb will decrease. 
C)  The brightness of the bulb will not change. 
D)  The potential drop across R2 will decrease. 
E)  The potential drop across R2 will not change. 
A)  The brightness of the bulb will increase. 
B)  The brightness of the bulb will decrease. 
C)  The brightness of the bulb will not change. 
D)  The potential drop across R2 will decrease. 
E)  The potential drop across R2 will not change.

Question 8

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.Compared to the polarity shown in the figure,the emf ε1 is closest to

Accepted Answer

A)  -5 V. 
B)  5 V. 
C)  45 V. 
D)  51 V. 
E)  -51 V. 
A)  -5 V. 
B)  5 V. 
C)  45 V. 
D)  51 V. 
E)  -51 V.

Question 9

For the circuit shown in the figure,the switch S is initially open and the capacitor voltage is 80 V.The switch is then closed at time t = 0.What is the charge on the capacitor when the current in the circuit is 33 μA?

Accepted Answer

A)  1100 µC 
B)  1000 µC 
C)  960 µC 
D)  890 µC 
E)  830 µC 
A)  1100 µC 
B)  1000 µC 
C)  960 µC 
D)  890 µC 
E)  830 µC

Question 10

A light bulb is connected in the circuit shown in the figure with the switch S open and the capacitor uncharged.The battery has no appreciable internal resistance.Which one of the following graphs best describes the brightness B of the bulb as a function of time t after closing the switch?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 11

A galvanometer G has an internal resistance rg.A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance Rs.Which one of the figures below is the most appropriate circuit diagram for the voltmeter?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 12

When a 20.0-ohm resistor is connected across the terminals of a 12.0-V battery,the voltage across the terminals of the battery falls by 0.300 V.What is the internal resistance of this battery?

Accepted Answer

A)  3.60 Ω 
B)  1.56 Ω 
C)  0.98 Ω 
D)  0.30 Ω 
E)  0.51 Ω 
A)  3.60 Ω 
B)  1.56 Ω 
C)  0.98 Ω 
D)  0.30 Ω 
E)  0.51 Ω

Question 13

Two unknown resistors are connected together.When they are connected in series their equivalent resistance is 15 Ω.When they are connected in parallel,their equivalent resistance is 3.3 Ω.What are the resistances of these resistors?

Accepted Answer

The answer of Two unknown resistors are connected together.When they...

Exam 26: Direct-Current Circuits

For the circuit shown in the figure,what current does the ideal ammeter read?

A galvanometer coil having a resistance of 20 Ω and a full-scale deflection at 1.0 mA is connected in series with a 4980 Ω resistance to build a voltmeter.What is the maximum voltage that this voltmeter can read?

When four identical resistors are connected to an ideal battery of voltage V = 10 V as shown in the figure,the current I is equal to 0.20 A.What is the value of the resistance R of the resistors?

In the circuit shown in the figure,an ideal ohmmeter is connected across ab with the switch S open.All the connecting leads have negligible resistance.The reading of the ohmmeter will be closest to

For the circuit shown in the figure,all quantities are accurate to 3 significant figures.What is the power dissipated in the 2-Ω resistor?

An RC circuit is connected across an ideal DC voltage source through an open switch.The switch is closed at time t = 0 s.Which of the following statements regarding the circuit are correct? (There may be more than one correct choice.)

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.Compared to the polarity shown in the figure,the emf ε1 is closest to

For the circuit shown in the figure,the switch S is initially open and the capacitor voltage is 80 V.The switch is then closed at time t = 0.What is the charge on the capacitor when the current in the circuit is 33 μA?

A light bulb is connected in the circuit shown in the figure with the switch S open and the capacitor uncharged.The battery has no appreciable internal resistance.Which one of the following graphs best describes the brightness B of the bulb as a function of time t after closing the switch?

A galvanometer G has an internal resistance rg.A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance Rs.Which one of the figures below is the most appropriate circuit diagram for the voltmeter?

When a 20.0-ohm resistor is connected across the terminals of a 12.0-V battery,the voltage across the terminals of the battery falls by 0.300 V.What is the internal resistance of this battery?

Two unknown resistors are connected together.When they are connected in series their equivalent resistance is 15 Ω.When they are connected in parallel,their equivalent resistance is 3.3 Ω.What are the resistances of these resistors?

Units,physical Quantities,and Vectors

Motion Along a Straight Line

Motion in Two or Three Dimensions

Newtons Laws of Motion

Applying Newtons Laws

Work and Kinetic Energy

Potential Energy and Energy Conservation

Momentum,impulse,and Collisions

Rotation of Rigid Bodies

Dynamics of Rotational Motion

Equilibrium and Elasticity

Fluid Mechanics

Gravitation

Periodic Motion

Mechanical Waves

Sound and Hearing

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

The Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current,resistance,and Electromotive Force

Magnetic Field and Magnetic Forces

Sources of Magnetic Field

Electromagnetic Induction

Inductance

Alternating Current

Electromagnetic Waves

The Nature and Propagation of Light

Geometric Optics

Interference

Diffraction

Relativity

Photons: Light Waves Behaving As Particles

Particles Behaving As Waves

Quantum Mechanics

Atomic Structure

Molecules and Condensed Matter

Nuclear Physics

Particle Physics and Cosmology

Filters

A multiloop circuit is shown in the figure.It is not necessary to solve the entire circuit.Compared to the polarity shown in the figure,the emf ε₁is closest to

A galvanometer G has an internal resistance r_g.A VOLTMETER is constructed by incorporating the galvanometer and an additional resistance R_s.Which one of the figures below is the most appropriate circuit diagram for the voltmeter?