Question 1

Three equal charges +Q are at three of the corners of a square of side d. A fourth charge +Q of equal magnitude is at the center of the square as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the center of the square?

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) C) and D)
F) None of the above

Question 2

Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s2. What is the magnitude of the charge on each bead? (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2)

Accepted Answer

A)   510 nC
B)   44 nC
C)   1800 nC
D)   890 nC
E)   1300 nCF) C) and D)
G) All of the above

Question 3

An electron is projected with an initial velocity v0 = 8.4 ×  10710^7107  m/s along the y-axis, which is the centerline between a pair of charged plates, as shown in the figure. The plates are 1.0 m long and are separated by 0.10 m. A uniform electric field of magnitude E in the +x-direction is present between the plates. If the magnitude of the acceleration of the electron is measured to be  8.9×1015 m/s28.9 	imes 10 ^ { 15 } \mathrm {~m} / \mathrm { s } ^ { 2 }8.9×1015 m/s2  what is the magnitude of the electric field between the plates? (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg)  0 = 8.4 ×  10^7  m/s along the y-axis, which is the centerline between a pair of charged plates, as shown in the figure. The plates are 1.0 m long and are separated by 0.10 m. A uniform electric field of magnitude E in the +x-direction is present between the plates. If the magnitude of the acceleration of the electron is measured to be  8.9 	imes 10 ^ { 15 } \mathrm {~m} / \mathrm { s } ^ { 2 }  what is the magnitude of the electric field between the plates? (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg)    A)  51,000 N/C B)  45,000 N/C C)  40,000 N/C D)  35,000 N/C E)  29,000 N/C " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   51,000 N/C
B)   45,000 N/C
C)   40,000 N/C
D)   35,000 N/C
E)   29,000 N/C F) A) and E)
G) None of the above

Question 4

What is the charge on 1.0 kg of protons?
(e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)

Accepted Answer

A)   1.0 C
B)   1000 C
C)   9.6 × 107 C
D)   6.0 × 1026 C
E)   6.0 × 1023 CF) A) and E)
G) All of the above

Question 5

Three equal-magnitude point charges of varying signs are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) A) and D)
F) None of the above

Question 6

A +5.0-μC point charge is placed at the 0 cm mark of a meter stick and a -4.0-μC charge is placed at the 50 cm mark. What is the net electric field at the 30 cm mark? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Accepted Answer

A)   4.0 × 105 N/C
B)   5.0 × 105 N/C
C)   9.0 × 105 N/C
D)   1.4 × 106 N/CE) C) and D)
F) All of the above

Question 7

Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 106 N/C.
(a) What is the charge per unit area on each plate?
(b) If the plates are now moved two times farther apart, what is the electric field between the plates?

Accepted Answer

(a) ±67 µC...

Question 8

A negatively-charged plastic rod is brought close to (but does not touch)  a neutral metal sphere that is connected to ground. After waiting a few seconds, the ground connection is removed (without touching the sphere) , and after that the rod is also removed. The sphere is now

Accepted Answer

A)   negatively charged.
B)   positively charged.
C)   neutral.D) A) and B)
E) All of the above

Question 9

An electric dipole consists of charges of ±6.00 µC that are 10.0 cm apart, as shown in the figure. Find the magnitude and direction of the electric field this dipole produces at point P, which is 7.00 cm from each charge. (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Accepted Answer

1.57 × 10⁷ N/C, to th...

Question 10

Two point charges each experience a 1-N electrostatic force when they are 2 cm apart. If they are moved to a new separation of 8 cm, what is the magnitude of the electric force on each of them?

Accepted Answer

A)   2 N
B)   1/2 N
C)   1/4 N
D)   1/8 N
E)   1/16 NF) All of the above
G) A) and E)

Question 11

Two tiny particles carrying like charges of the same magnitude are  1.0 mm1.0 \mathrm {~mm}1.0 mm  apart. If the electric force on one of them is  5.0 N, 5.0 \mathrm {~N} 	ext {, }5.0 N,   what is the magnitude of the charge on each of these particles?(k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2)

Accepted Answer

A)   2.4 × 10-2 C
B)   2.4 × 10-8 C
C)   4.5 × 104 C
D)   2.4 × 10-5 C E) A) and B)
F) None of the above

Question 12

A small object with a 5.0-μC charge is accelerating horizontally on a friction-free surface at 0.0050 m/s2 due only to an electric field. If the object has a mass of 2.0 g, what is the magnitude of the electric field?

Accepted Answer

A)   2.0 N/C
B)   4.0 N/C
C)   0.0020 N/C
D)   0.0040 N/C
E)   1.0 N/CF) A) and B)
G) C) and D)

Question 13

A conductor is placed in a steady external electric field. Which of the following statements are correct for this situation? (There could be more than one correct choice.)

Accepted Answer

A)   The electric field is zero inside the conductor.
B)   All the free electrons go to the surface of the conductor.
C)   The surface of the conductor is neutral.
D)   The electric field just outside the surface of the conductor is perpendicular to the surface.
E)   None of the above statements are correct.F) A) and B)
G) None of the above

Question 14

The figure shows electric field lines arising from two small charged particles P and Q. Consider the following two statements: (i)  The charge on P is smaller than the charge on Q.
(ii)  The electrostatic force on P is smaller than the force on Q.
Which of the above statements are true?

Accepted Answer

A)   Only (i)  is true.
B)   Only (ii)  is true.
C)   Both (i)  and (ii)  are true.
D)   Neither (i)  nor (ii)  is true.E) B) and C)
F) A) and B)

Question 15

Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state

Accepted Answer

A)   spheres #1 and #2 are still uncharged.
B)   sphere #1 carries positive charge and #2 carries negative charge.
C)   sphere #1 carries negative charge and #2 carries positive charge.
D)   spheres #1 and #2 both carry positive charge.
E)   spheres #1 and #2 both carry negative charge.F) A) and B)
G) B) and D)

Exam 20: Electric Fields and Forces

Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state

Correct Answer
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A +5.0-μC point charge is placed at the 0 cm mark of a meter stick and a -4.0-μC charge is placed at the 50 cm mark. What is the net electric field at the 30 cm mark? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Two point charges each experience a 1-N electrostatic force when they are 2 cm apart. If they are moved to a new separation of 8 cm, what is the magnitude of the electric force on each of them?

Correct Answer
verified

Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s². What is the magnitude of the charge on each bead? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Two tiny particles carrying like charges of the same magnitude are $1.0 \mathrm {~mm}$ apart. If the electric force on one of them is $5.0 \mathrm {~N} \text {, }$ what is the magnitude of the charge on each of these particles?(k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

Correct Answer
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Three equal-magnitude point charges of varying signs are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?

Correct Answer
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The figure shows electric field lines arising from two small charged particles P and Q. Consider the following two statements: (i) The charge on P is smaller than the charge on Q. (ii) The electrostatic force on P is smaller than the force on Q. Which of the above statements are true?

Correct Answer
verified

Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 10⁶ N/C. (a) What is the charge per unit area on each plate? (b) If the plates are now moved two times farther apart, what is the electric field between the plates?

Correct Answer
verified
(a) ±67 µC...
View Answer

An electric dipole consists of charges of ±6.00 µC that are 10.0 cm apart, as shown in the figure. Find the magnitude and direction of the electric field this dipole produces at point P, which is 7.00 cm from each charge. (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified
1.57 × 10⁷ N/C, to th...
View Answer

Three equal charges +Q are at three of the corners of a square of side d. A fourth charge +Q of equal magnitude is at the center of the square as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the center of the square?

Correct Answer
verified

A conductor is placed in a steady external electric field. Which of the following statements are correct for this situation? (There could be more than one correct choice.)

Correct Answer
verified

A small object with a 5.0-μC charge is accelerating horizontally on a friction-free surface at 0.0050 m/s2 due only to an electric field. If the object has a mass of 2.0 g, what is the magnitude of the electric field?

Correct Answer
verified

What is the charge on 1.0 kg of protons? (e = 1.60 × 10^-19 C, m_proton = 1.67 × 10^-27 kg)

Correct Answer
verified

A negatively-charged plastic rod is brought close to (but does not touch) a neutral metal sphere that is connected to ground. After waiting a few seconds, the ground connection is removed (without touching the sphere) , and after that the rod is also removed. The sphere is now

Correct Answer
verified

Correct Answer
verified

Exam 20: Electric Fields and Forces

Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near #2. Now a copper wire is momentarily connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state

Correct AnswerverifiedShow Answer

A +5.0-μC point charge is placed at the 0 cm mark of a meter stick and a -4.0-μC charge is placed at the 50 cm mark. What is the net electric field at the 30 cm mark? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

Two point charges each experience a 1-N electrostatic force when they are 2 cm apart. If they are moved to a new separation of 8 cm, what is the magnitude of the electric force on each of them?

Correct AnswerverifiedShow Answer

Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s2. What is the magnitude of the charge on each bead? (k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

Two tiny particles carrying like charges of the same magnitude are 1.0 mm1.0 \mathrm {~mm}1.0 mm apart. If the electric force on one of them is 5.0 N, 5.0 \mathrm {~N} \text {, }5.0 N, what is the magnitude of the charge on each of these particles?(k = 1/4πε0 = 9.0 × 109 N ∙ m2/C2)

Correct AnswerverifiedShow Answer

Three equal-magnitude point charges of varying signs are placed at three of the corners of a square of side d as shown in the figure. Which one of the arrows shown represents the direction of the net electric field at the vacant corner of the square?

Correct AnswerverifiedShow Answer

The figure shows electric field lines arising from two small charged particles P and Q. Consider the following two statements: (i) The charge on P is smaller than the charge on Q. (ii) The electrostatic force on P is smaller than the force on Q. Which of the above statements are true?

Correct AnswerverifiedShow Answer

Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 106 N/C. (a) What is the charge per unit area on each plate? (b) If the plates are now moved two times farther apart, what is the electric field between the plates?

Correct Answerverified(a) ±67 µC...View AnswerShow Answer

An electric dipole consists of charges of ±6.00 µC that are 10.0 cm apart, as shown in the figure. Find the magnitude and direction of the electric field this dipole produces at point P, which is 7.00 cm from each charge. (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Correct Answerverified1.57 × 107 N/C, to th...View AnswerShow Answer

Three equal charges +Q are at three of the corners of a square of side d. A fourth charge +Q of equal magnitude is at the center of the square as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the center of the square?

Correct AnswerverifiedShow Answer

A conductor is placed in a steady external electric field. Which of the following statements are correct for this situation? (There could be more than one correct choice.)

Correct AnswerverifiedShow Answer

A small object with a 5.0-μC charge is accelerating horizontally on a friction-free surface at 0.0050 m/s2 due only to an electric field. If the object has a mass of 2.0 g, what is the magnitude of the electric field?

Correct AnswerverifiedShow Answer

What is the charge on 1.0 kg of protons? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)

Correct AnswerverifiedShow Answer

A negatively-charged plastic rod is brought close to (but does not touch) a neutral metal sphere that is connected to ground. After waiting a few seconds, the ground connection is removed (without touching the sphere) , and after that the rod is also removed. The sphere is now

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

A +5.0-μC point charge is placed at the 0 cm mark of a meter stick and a -4.0-μC charge is placed at the 50 cm mark. What is the net electric field at the 30 cm mark? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Correct Answer
verified

Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s². What is the magnitude of the charge on each bead? (k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Two tiny particles carrying like charges of the same magnitude are $1.0 \mathrm {~mm}$ apart. If the electric force on one of them is $5.0 \mathrm {~N} \text {, }$ what is the magnitude of the charge on each of these particles?(k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 10⁶ N/C. (a) What is the charge per unit area on each plate? (b) If the plates are now moved two times farther apart, what is the electric field between the plates?

Correct Answer
verified
(a) ±67 µC...
View Answer

An electric dipole consists of charges of ±6.00 µC that are 10.0 cm apart, as shown in the figure. Find the magnitude and direction of the electric field this dipole produces at point P, which is 7.00 cm from each charge. (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

Correct Answer
verified
1.57 × 10⁷ N/C, to th...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

What is the charge on 1.0 kg of protons? (e = 1.60 × 10^-19 C, m_proton = 1.67 × 10^-27 kg)

Correct Answer
verified

Correct Answer
verified

Correct Answer
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