Question 1

If R = 3.0 kΩ, C = 5.0 mF, ε = 6.0 V, Q = 15 mC, and I = 4.0 mA, what is the potential difference Vb − Va?

Accepted Answer

A)  −3.0 V 
B)  +9.0 V 
C)  −15 V 
D)  +21 V 
E)  −6.0 V 
A)  −3.0 V 
B)  +9.0 V 
C)  −15 V 
D)  +21 V 
E)  −6.0 V A

Question 2

At what rate is thermal energy being generated in the 2R-resistor when ε = 12 V and R = 3.0 Ω?

Accepted Answer

A)  12 W 
B)  24 W 
C)  6.0 W 
D)  3.0 W 
E)  1.5 W 
A)  12 W 
B)  24 W 
C)  6.0 W 
D)  3.0 W 
E)  1.5 W C

Question 3

If R1 = 3.0 Ω, R2 = 6.0 Ω, R3 = 12 Ω, and I = 0.50 A, at what rate is heat being generated in R1?

Accepted Answer

A)  20 W 
B)  17 W 
C)  12 W 
D)  31 W 
E)  6.0 W 
A)  20 W 
B)  17 W 
C)  12 W 
D)  31 W 
E)  6.0 W C

Question 4

What is the current in the 10-Ω resistor ?

Accepted Answer

A)  0.60 A 
B)  3.0 A 
C)  1.2 A 
D)  2.4 A 
E)  0.30 A 
A)  0.60 A 
B)  3.0 A 
C)  1.2 A 
D)  2.4 A 
E)  0.30 A

Question 5

What is the potential difference VB − VA when I = 0.50 A in the circuit segment shown below?

Accepted Answer

A)  +28 V 
B)  +2.0 V 
C)  −28 V 
D)  −2.0 V 
E)  +18 V 
A)  +28 V 
B)  +2.0 V 
C)  −28 V 
D)  −2.0 V 
E)  +18 V

Question 6

The algebraic sum of the changes of potential around any closed circuit loop is

Accepted Answer

A)  zero. 
B)  maximum. 
C)  zero only if there are no sources of emf in the loop. 
D)  maximum if there are no sources of emf in the loop. 
E)  equal to the sum of the currents in the branches of the loop. 
A)  zero. 
B)  maximum. 
C)  zero only if there are no sources of emf in the loop. 
D)  maximum if there are no sources of emf in the loop. 
E)  equal to the sum of the currents in the branches of the loop.

Question 7

At t = 0 the switch S is closed with the capacitor uncharged. If C = 50 μF, ε = 20 V, and R = 4.0 kΩ, what is the charge on the capacitor when I = 2.0 mA?

Accepted Answer

A)  360 μC 
B)  480 μC 
C)  240 μC 
D)  600 μC 
E)  400 μC 
A)  360 μC 
B)  480 μC 
C)  240 μC 
D)  600 μC 
E)  400 μC

Question 8

If R = 2.0 kΩ, C = 4.0 mF, ε = 8.0 V, Q = 20 mC, and I = 3.0 mA, what is the potential difference Vb − Va?

Accepted Answer

A)  +7.0 V 
B)  +19 V 
C)  +9.0 V 
D)  −3.0 V 
E)  −14 V 
A)  +7.0 V 
B)  +19 V 
C)  +9.0 V 
D)  −3.0 V 
E)  −14 V

Question 9

Determine the current in the 10-V emf.

Accepted Answer

A)  2.3 A 
B)  2.7 A 
C)  1.3 A 
D)  0.30 A 
E)  2.5 A 
A)  2.3 A 
B)  2.7 A 
C)  1.3 A 
D)  0.30 A 
E)  2.5 A

Question 10

When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?

Accepted Answer

A)  7.2 Ω 
B)  7.6 Ω 
C)  6.9 Ω 
D)  8.0 Ω 
E)  2.8 Ω 
A)  7.2 Ω 
B)  7.6 Ω 
C)  6.9 Ω 
D)  8.0 Ω 
E)  2.8 Ω

Question 11

If ε 1 = 4.0 V, ε 2 = 12.0 V, R1 = 4 Ω, R2 = 12 Ω, C = 3 μF, Q = 18 μC, and I = 2.5 A, what is the potential difference Va − Vb?

Accepted Answer

A)  −30 V 
B)  30 V 
C)  5.0 V 
D)  −5.0 V 
E)  −1.0 V 
A)  −30 V 
B)  30 V 
C)  5.0 V 
D)  −5.0 V 
E)  −1.0 V

Question 12

Determine R when I = 0.20 A and ε = 18 V.

Accepted Answer

A)  50 Ω 
B)  8.0 Ω 
C)  10 Ω 
D)  20 Ω 
E)  30 Ω 
A)  50 Ω 
B)  8.0 Ω 
C)  10 Ω 
D)  20 Ω 
E)  30 Ω

Question 13

The circuit below contains three 100-watt light bulbs and a capacitor. The emf ε = 110V. The capacitor is fully charged. Which light bulb(s) is(are) dimmest?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  A and B 
E)  All three are equally bright (or dim). 
A)  A 
B)  B 
C)  C 
D)  A and B 
E)  All three are equally bright (or dim).

Question 14

If R1 = 10 Ω, R2 = 15 Ω, R3 = 20 Ω, and I = 0.50 A, at what rate is heat being generated in these resistors?

Accepted Answer

A)  29 W 
B)  16 W 
C)  22 W 
D)  11 W 
E)  1.1 W 
A)  29 W 
B)  16 W 
C)  22 W 
D)  11 W 
E)  1.1 W

Question 15

If 480 C pass through a 4.0-Ω resistor in 10 min, what is the potential difference across the resistor?

Accepted Answer

A)  3.6 V 
B)  2.8 V 
C)  2.4 V 
D)  3.2 V 
E)  5.0 V 
A)  3.6 V 
B)  2.8 V 
C)  2.4 V 
D)  3.2 V 
E)  5.0 V

Question 16

What is the magnitude of the potential difference across the 20-Ω resistor?

Accepted Answer

A)  3.2 V 
B)  7.8 V 
C)  11 V 
D)  5.0 V 
E)  8.6 V 
A)  3.2 V 
B)  7.8 V 
C)  11 V 
D)  5.0 V 
E)  8.6 V

Question 17

The circuit below contains 5 identical light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?

Accepted Answer

A)  A: The one closest to the positive terminal of the battery. 
B)  A and C: The bulbs closest to the positive terminal of the battery. 
C)  A and B: Because they are closest to the terminals of the battery. 
D)  C and D: Because they receive current from A and B and from E. 
E)  E: Because the potential difference across E is that of the battery. 
A)  A: The one closest to the positive terminal of the battery. 
B)  A and C: The bulbs closest to the positive terminal of the battery. 
C)  A and B: Because they are closest to the terminals of the battery. 
D)  C and D: Because they receive current from A and B and from E. 
E)  E: Because the potential difference across E is that of the battery.

Question 18

If I = 0.40 A in the circuit segment shown below, what is the potential difference Va − Vb?

Accepted Answer

A)  31 V 
B)  28 V 
C)  25 V 
D)  34 V 
E)  10 V 
A)  31 V 
B)  28 V 
C)  25 V 
D)  34 V 
E)  10 V

Question 19

The circuit below contains three 100-W light bulbs and a capacitor. The emf ε = 110V. At the instant the switch S is closed, which light bulb is brightest?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  A and B 
E)  All three are equally bright. 
A)  A 
B)  B 
C)  C 
D)  A and B 
E)  All three are equally bright.

Question 20

What is the equivalent resistance between points A and B in the figure when R = 18 Ω?

Accepted Answer

A)  48 Ω 
B)  64 Ω 
C)  80 Ω 
D)  96 Ω 
E)  110 Ω 
A)  48 Ω 
B)  64 Ω 
C)  80 Ω 
D)  96 Ω 
E)  110 Ω

Exam 28: Direct-Current Circuits

If R = 3.0 kΩ, C = 5.0 mF, ε = 6.0 V, Q = 15 mC, and I = 4.0 mA, what is the potential difference Vb − Va?

At what rate is thermal energy being generated in the 2R-resistor when ε = 12 V and R = 3.0 Ω?

If R1 = 3.0 Ω, R2 = 6.0 Ω, R3 = 12 Ω, and I = 0.50 A, at what rate is heat being generated in R1?

What is the current in the 10-Ω resistor ?

What is the potential difference VB − VA when I = 0.50 A in the circuit segment shown below?

The algebraic sum of the changes of potential around any closed circuit loop is

At t = 0 the switch S is closed with the capacitor uncharged. If C = 50 μF, ε = 20 V, and R = 4.0 kΩ, what is the charge on the capacitor when I = 2.0 mA?

If R = 2.0 kΩ, C = 4.0 mF, ε = 8.0 V, Q = 20 mC, and I = 3.0 mA, what is the potential difference Vb − Va?

Determine the current in the 10-V emf.

When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in each of the resistors. When the same emf is placed across the same two resistors in parallel, the current through the emf is 10 A. What is the magnitude of the greater of the two resistances?

If ε 1 = 4.0 V, ε 2 = 12.0 V, R1 = 4 Ω, R2 = 12 Ω, C = 3 μF, Q = 18 μC, and I = 2.5 A, what is the potential difference Va − Vb?

Determine R when I = 0.20 A and ε = 18 V.

The circuit below contains three 100-watt light bulbs and a capacitor. The emf ε = 110V. The capacitor is fully charged. Which light bulb(s) is(are) dimmest?

If R1 = 10 Ω, R2 = 15 Ω, R3 = 20 Ω, and I = 0.50 A, at what rate is heat being generated in these resistors?

If 480 C pass through a 4.0-Ω resistor in 10 min, what is the potential difference across the resistor?

What is the magnitude of the potential difference across the 20-Ω resistor?

The circuit below contains 5 identical light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?

If I = 0.40 A in the circuit segment shown below, what is the potential difference Va − Vb?

The circuit below contains three 100-W light bulbs and a capacitor. The emf ε = 110V. At the instant the switch S is closed, which light bulb is brightest?

What is the equivalent resistance between points A and B in the figure when R = 18 Ω?

Physics and Measurement

Motion in One Dimension

Vectors

Motion in Two Dimensions

The Laws of Motion

Circular Motion and Other Applications of Newtons Laws

Energy of a System

Conservation of Energy

Linear Momentum and Collisions

Rotation of a Rigid Object About a Fixed Axis

Angular Momentum

Static Equilibrium and Elasticity

Universal Gravitation

Fluid Mechanics

Oscillatory Motion

Wave Motion

Superposition and Standing Waves

Temperature

The First Law of Thermodynamics

The Kinetic Theory of Gases

Heat Engines, Entropy, and the Second Law of Thermodynamics

Electric Fields

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current and Resistance

Magnetic Fields

Sources of the Magnetic Field

Faradays Law

Inductance

Alternating-Current Circuits

Electromagnetic Waves

The Nature of Light and the Principles of Ray Optics

Image Formation

Wave Optics

Diffraction Patterns and Polarization

Relativity

Introduction to Quantum Physics

Quantum Mechanics

Atomic Physics

Molecules and Solids

Nuclear Structure

Particle Physics and Cosmology

Filters

If R = 3.0 kΩ, C = 5.0 mF, ε = 6.0 V, Q = 15 mC, and I = 4.0 mA, what is the potential difference V_b − V_a?

If R₁ = 3.0 Ω, R₂ = 6.0 Ω, R₃ = 12 Ω, and I = 0.50 A, at what rate is heat being generated in R₁?

What is the potential difference V_B − V_A when I = 0.50 A in the circuit segment shown below?

If R = 2.0 kΩ, C = 4.0 mF, ε = 8.0 V, Q = 20 mC, and I = 3.0 mA, what is the potential difference V_b − V_a?

If ε ₁ = 4.0 V, ε ₂ = 12.0 V, R₁ = 4 Ω, R₂ = 12 Ω, C = 3 μF, Q = 18 μC, and I = 2.5 A, what is the potential difference V_a − V_b?

If R₁ = 10 Ω, R₂ = 15 Ω, R₃ = 20 Ω, and I = 0.50 A, at what rate is heat being generated in these resistors?

If I = 0.40 A in the circuit segment shown below, what is the potential difference V_a − V_b?