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# Classroom Response System Questions

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### Chapter 21 Electric Change

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21.3.7. Silicon is an example of what type of material?

a) metal b) insulator

c) semiconductor d) superconductor e) perfect conductor

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21.6.2. When an electron (charge 1.60 × 1019 C) and a positron (charge +1.60 × 1019 C) come together, they annihilate one another. Two particles of light (photons) are emitted from the annihilation. This is an example of what type of physical

phenomena?

a) charge quantization b) charge separation c) Coulomb force

d) charge density wave e) charge conservation

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21.4.1. Two objects separated by a distance r are each carrying a charge q. The magnitude of the force exerted on the second

object by the first is F. If the first object is removed and replaced with an identical object that carries a charge +4q, what is the

magnitude of the electric force on the second object?

a) 4F b) 2F c) F d) F/2 e) F/4

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21.3.6. Consider the conducting spheres labeled A, B, and C shown in the drawing.

The spheres are initially charged as shown on the left, then wires are connected and disconnected in a sequence shown moving toward the right. What is the final charge on sphere A at the end of the sequence?

a) +Q b) + Q/2 c) + Q/3 d) + Q/4 e) + Q/8

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21.6.1. The smallest charge on a single particle has been measured to be 1.60 × 1019 C. What can we conclude from the fact that no smaller charges have been measured?

a) Charge is quantized.

b) Electrons are conserved.

c) Charge is conserved.

d) Electrons have the smallest unit of charge.

e) Charge is the same as mass.

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### Chapter 23 Gauss’ Law

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23.3.1. In each of the four cases below a Gaussian circle is represented by the dashed line circle and the arrows represent electric field lines. In which of the four

cases is the flux through the Gaussian circle not equal to zero?

a) A and B only b) C and D only c) A only

d) D only

e) A, B, C, and D

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23.6.3. Why must the electric field at the surface of a conductor be perpendicular to the surface?

a) Excess charge in a conductor always moves to the surface of the conductor.

b) Flux is always perpendicular to the surface.

c) If it was not perpendicular, then charges on the surface would be moving.

d) The electric field lines from a single charge extend radially outward or inward.

e) None of the above choices are correct.

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23.6.5. A spherical conductor has a radius R and a tiny spherical cavity at its center that has a radius R/10. The conductor is otherwise solid. Inside the cavity is a positive charge Q. What is the electric field at a distance R/2 from the center?

a) zero N/C b)

c)

d)

e)

2 0

1 4 E Q

 R

1 2

0 2

1 4 E Q

 R

1 2

0 10

1 4 E Q

 R

###  

1

0 2

1 4 E Q

 R

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23.7.1. What is the best choice for the shape of a Gaussian surface?

a) spherical b) cylindrical c) cubic

d) It should be one that encloses the smallest volume.

e) It should be one that matches the symmetry of the charge distribution.

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23.8.1. Consider the situation shown to the left below. There are two parallel non-conducting plates. The plate on the left is positively charged with (3/2) the surface charge density to that of the right plate, which is negatively charged. Which one of the drawings shows the correct net electric field that results from this situation?

a) A b) B c) C d) D

e) None of these drawings is correct.

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23.9.1. A spherical conductor has a radius R and a tiny spherical cavity at its center that has a radius R/10. The conductor is otherwise solid. Inside the cavity is a positive charge Q. What is the electric field at a distance 2R from the center?

a) zero N/C b)

c)

d)

e)

2 0

1 4 E Q

 R

1 2

0 2

1 4 E Q

 R

1 2

0 10

1 4 E Q

 R

2

0

1

4 2

E Q

 R

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### Chapter 24 Electric Potential

Interactive Lecture Questions

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1. The electric potential energy for two positive charges of

magnitude q and separated by a distance r is U1. What will the electric potential energy be if one of the charges is completely removed and replaced by a negative charge of the same

magnitude?

a) U2 = 2U1 b) U2 = U1 c) U2 = U1 d) U2 = 2 U1

e) There is no way to determine this without knowing the value of q.

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2. Why is an electrostatic force considered a conservative force?

a) Charged particles do not experience friction, which is a non- conservative force.

b) The energy required to move a charged particle around a closed path is equal to zero joules.

c) The work required to move a charged particle from one point to another does not depend upon the path taken.

d) Answers (a) and (b) are both correct.

e) Answers (b) and (c) are both correct.

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3. The drawing shows three point charges of equal magnitude, but one is positive (shown in blue) and two are negative (shown in yellow). Some of the equipotential lines surrounding these charges are shown and five are labeled using letters A, B, C, D, and E. At which of the labeled

points will an electron have the greatest electric potential energy?

a) A b) B c) C d) D e) E

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4. Consider the equipotential lines shown in the box. The labeled cases indicate electric field line drawings.

Which of these cases best matches the equipotential lines shown?

a) 1 b) 2 c) 3 d) 4

e) None of these cases match the equipotential lines shown.

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### Chapter 25 Capacitance

Interactive Lecture Questions

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## 用是甚麼?

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### Chapter 25 Current and Resistance

Interactive Lecture Questions

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2

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### Chapter 26 Circuits

Interactive Lecture Questions

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### Chapter 26 Circuits

Interactive Lecture Questions

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### Chapter 26 Circuits

Interactive Lecture Questions

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enc0

enc

0

##  

0 0

1

 

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th

### Chapter 26 Circuits

Interactive Lecture Questions

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### 2.

Situations指的是哪兩種現象？

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### Chapter 31 AC Circuits

Interactive Lecture Questions

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### Chapter 32 Magnetism of Matter Maxwell’s Equations

Interactive Lecture Questions

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### Chapter 33 Electromagnetic Waves

Interactive Lecture Questions

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### 3.

(a)請舉一個電磁波的例子；

(b)說明它在電磁光譜上的哪一段；

(c)它有何應用？

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th

### Chapter 34 Images–Geometrical Optics

Interactive Lecture Questions

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### Chapter 35 Optical Instruments

Interactive Lecture Questions

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### Chapter 36 Interference

Interactive Lecture Questions

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Michelson

Interferometer。

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