Question 1

When introduced into a region where an electric field is present, a proton with initial velocity  will eventually move

Accepted Answer

A)   along an electric field line, in the positive direction of the line.
B)   along an electric field line, in the negative direction of the line.
C)   to a point of decreased potential.
D)   as described in both (a)  and (c) .E) None of the above
F) A) and B)

Question 2

When introduced into a region where an electric field is present, an electron with initial velocity  will eventually move

Accepted Answer

A)   along an electric field line, in the positive direction of the line.
B)   along an electric field line, in the negative direction of the line.
C)   to a point of decreased potential.
D)   to a point of increased potential.
E)   as described in both (b)  and (d) .F) A) and C)
G) C) and D)

Question 3

A proton (mass = 1.67 × 10−27 kg, charge = 1.60 × 10−19 C)  moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB − VA.

Accepted Answer

A)   +15 V
B)   −15 V
C)   −33 V
D)   +33 V
E)   −20 VF) A) and D)
G) C) and E)

Question 4

When a charged particle is moved along an electric field line,

Accepted Answer

A)   the electric field does no work on the charge.
B)   the electrical potential energy of the charge does not change.
C)   the electrical potential energy of the charge undergoes the maximum change in magnitude.
D)   the voltage changes, but there is no change in electrical potential energy.
E)   the electrical potential energy undergoes the maximum change, but there is no change in voltage.F) B) and D)
G) A) and B)

Question 5

Identical 4.0-μC charges are placed on the y axis at y = ±4.0 m. Point A is on the x axis at x = +3.0 m. Determine the electric potential of point A (relative to zero at the origin) .

Accepted Answer

A)   −4.5 kV
B)   −2.7 kV
C)   −1.8 kV
D)   −3.6 kV
E)   −14 kVF) A) and B)
G) A) and C)

Question 6

A particle (charge 7.5 μC)  is released from rest at a point on the x axis, x = 10 cm. It begins to move due to the presence of a 2.0-μC charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passes the point x = 1.0 m?

Accepted Answer

A)   3.0 J
B)   1.8 J
C)   2.4 J
D)   1.2 J
E)   1.4 JF) A) and B)
G) C) and E)

Question 7

Two charges lie on the x axis, +2q at the origin, and −3q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero)  is

Accepted Answer

A)   1.0 m.
B)   2.0 m.
C)   2.5 m.
D)   3.0 m.
E)   4.0 m.F) None of the above
G) B) and D)

Question 8

The electric potential inside a charged solid spherical conductor in equilibrium

Accepted Answer

A)   is always zero.
B)   is constant and equal to its value at the surface.
C)   decreases from its value at the surface to a value of zero at the center.
D)   increases from its value at the surface to a value at the center that is a multiple of the potential at the surface.
E)   is equal to the charge passing through the surface per unit time divided by the resistance.F) A) and E)
G) C) and D)

Question 9

Identical point charges (+20 μC)  are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 μC from infinity to the midpoint of one side of the triangle?

Accepted Answer

A)   26 J
B)   16 J
C)   23 J
D)   21 J
E)   12 JF) A) and E)
G) A) and D)

Question 10

When a negative charge is released and moves along an electric field line, it moves to a position of

Accepted Answer

A)   lower potential and lower potential energy.
B)   lower potential and higher potential energy.
C)   higher potential and lower potential energy.
D)   higher potential and higher potential energy.
E)   decreasing magnitude of the electric field.F) B) and E)
G) A) and B)

Question 11

A system consisting of a positively-charged particle and an electric field

Accepted Answer

A)   loses potential difference and kinetic energy when the charged particle moves in the direction of the field.
B)   loses electric potential energy when the charged particle moves in the direction of the field.
C)   loses kinetic energy when the charged particle moves in the direction of the field.
D)   gains electric potential energy when the charged particle moves in the direction of the field.
E)   gains potential difference and electric potential energy when the charged particle moves in the direction of the field.F) C) and D)
G) A) and C)

Question 12

A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m3. What is the magnitude of the potential difference between the center and a point 4.0 cm away?

Accepted Answer

A)   12 V
B)   6.8 V
C)   3.0 V
D)   4.7 V
E)   2.2 VF) A) and E)
G) None of the above

Question 13

An uncharged metal sphere is placed on an insulating puck on a frictionless table. While being held parallel to the table, a rod with a charge q is brought close to the sphere, but does not touch it. As the rod is brought in, the sphere

Accepted Answer

A)   remains at rest.
B)   moves toward the rod.
C)   moves away from the rod.
D)   moves perpendicular to the velocity vector of the rod.
E)   moves upward off the puck.F) A) and B)
G) B) and E)

Question 14

The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10−10 m. The electric potential created by the electron at the position of the proton is

Accepted Answer

A)   −13.6 V.
B)   +13.6 V.
C)   −27.2 V.
D)   +27.2 V.
E)   +5.12 × 109 V.F) C) and D)
G) A) and D)

Question 15

Two charges lie on the x axis, +3q at the origin, and −2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero)  is

Accepted Answer

A)   1.0 m.
B)   2.0 m.
C)   2.5 m.
D)   3.0 m.
E)   4.0 m.F) All of the above
G) B) and E)

Question 16

A particle (mass = 6.7 × 10−27 kg, charge = 3.2 × 10−19 C)  moves along the positive x axis with a speed of 4.8 × 105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?

Accepted Answer

A)   2.0 kN/C
B)   1.5 kN/C
C)   1.2 kN/C
D)   3.5 kN/C
E)   2.4 kN/CF) C) and D)
G) A) and D)

Question 17

Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential energy from most positive to most negative when traveling from A to B.  I > IV. C)  III > I = IV > II. D)  II > I = IV > III. E)  I > II = III > IV." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   I = II = III = IV.
B)   II = III > I > IV.
C)   III > I = IV > II.
D)   II > I = IV > III.
E)   I > II = III > IV.F) A) and D)
G) A) and C)

Question 18

A charge of 20 nC is distributed uniformly along the x axis from x = −2.0 m to x = +2.0 m. What is the electric potential (relative to zero at infinity)  at the point x = 5.0 m on the x axis?

Accepted Answer

A)   57 V
B)   48 V
C)   38 V
D)   67 V
E)   100 VF) B) and E)
G) A) and E)

Question 19

The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 106 V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?

Accepted Answer

Question 20

A point charge of 6.0 nC is placed at the center of a hollow spherical conductor (inner radius = 1.0 cm, outer radius = 2.0 cm)  which has a net charge of −4.0 nC. Determine the resulting charge density on the inner surface of the conducting sphere.

Accepted Answer

A)   +4.8 μC/m2
B)   −4.8 μC/m2
C)   −9.5 μC/m2
D)   +9.5 μC/m2
E)   −8.0 μC/m2F) B) and D)
G) All of the above

Exam 25: Electric Potential

When a negative charge is released and moves along an electric field line, it moves to a position of

Correct Answer
verified

Identical 4.0-μC charges are placed on the y axis at y = ±4.0 m. Point A is on the x axis at x = +3.0 m. Determine the electric potential of point A (relative to zero at the origin) .

Correct Answer
verified

Two charges lie on the x axis, +2q at the origin, and −3q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is

Correct Answer
verified

Correct Answer
verified

A point charge of 6.0 nC is placed at the center of a hollow spherical conductor (inner radius = 1.0 cm, outer radius = 2.0 cm) which has a net charge of −4.0 nC. Determine the resulting charge density on the inner surface of the conducting sphere.

Correct Answer
verified

The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 10⁶ V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?

Correct Answer
verified

A particle (charge 7.5 μC) is released from rest at a point on the x axis, x = 10 cm. It begins to move due to the presence of a 2.0-μC charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passes the point x = 1.0 m?

Correct Answer
verified

When introduced into a region where an electric field is present, an electron with initial velocity will eventually move

Correct Answer
verified

A system consisting of a positively-charged particle and an electric field

Correct Answer
verified

Two charges lie on the x axis, +3q at the origin, and −2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is

Correct Answer
verified

Identical point charges (+20 μC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 μC from infinity to the midpoint of one side of the triangle?

Correct Answer
verified

When a charged particle is moved along an electric field line,

Correct Answer
verified

The electric potential inside a charged solid spherical conductor in equilibrium

Correct Answer
verified

A charge of 20 nC is distributed uniformly along the x axis from x = −2.0 m to x = +2.0 m. What is the electric potential (relative to zero at infinity) at the point x = 5.0 m on the x axis?

Correct Answer
verified

An uncharged metal sphere is placed on an insulating puck on a frictionless table. While being held parallel to the table, a rod with a charge q is brought close to the sphere, but does not touch it. As the rod is brought in, the sphere

Correct Answer
verified

Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential energy from most positive to most negative when traveling from A to B.

Correct Answer
verified

The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a₀ = 0.529 × 10−¹⁰ m. The electric potential created by the electron at the position of the proton is

Correct Answer
verified

A proton (mass = 1.67 × 10−²⁷ kg, charge = 1.60 × 10−¹⁹ C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference V_B − V_A.

Correct Answer
verified

A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m³. What is the magnitude of the potential difference between the center and a point 4.0 cm away?

Correct Answer
verified

When introduced into a region where an electric field is present, a proton with initial velocity will eventually move

Correct Answer
verified

Exam 25: Electric Potential

When a negative charge is released and moves along an electric field line, it moves to a position of

Correct AnswerverifiedShow Answer

Identical 4.0-μC charges are placed on the y axis at y = ±4.0 m. Point A is on the x axis at x = +3.0 m. Determine the electric potential of point A (relative to zero at the origin) .

Correct AnswerverifiedShow Answer

Two charges lie on the x axis, +2q at the origin, and −3q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is

Correct AnswerverifiedShow Answer

A particle (mass = 6.7 × 10−27 kg, charge = 3.2 × 10−19 C) moves along the positive x axis with a speed of 4.8 × 105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?

Correct AnswerverifiedShow Answer

A point charge of 6.0 nC is placed at the center of a hollow spherical conductor (inner radius = 1.0 cm, outer radius = 2.0 cm) which has a net charge of −4.0 nC. Determine the resulting charge density on the inner surface of the conducting sphere.

Correct AnswerverifiedShow Answer

The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 106 V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?

Correct AnswerverifiedShow Answer

A particle (charge 7.5 μC) is released from rest at a point on the x axis, x = 10 cm. It begins to move due to the presence of a 2.0-μC charge which remains fixed at the origin. What is the kinetic energy of the particle at the instant it passes the point x = 1.0 m?

Correct AnswerverifiedShow Answer

When introduced into a region where an electric field is present, an electron with initial velocity will eventually move

Correct AnswerverifiedShow Answer

A system consisting of a positively-charged particle and an electric field

Correct AnswerverifiedShow Answer

Two charges lie on the x axis, +3q at the origin, and −2q at x = 5.0 m. The point on the x axis where the electric potential has a zero value (when the value at infinity is also zero) is

Correct AnswerverifiedShow Answer

Identical point charges (+20 μC) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 μC from infinity to the midpoint of one side of the triangle?

Correct AnswerverifiedShow Answer

When a charged particle is moved along an electric field line,

Correct AnswerverifiedShow Answer

The electric potential inside a charged solid spherical conductor in equilibrium

Correct AnswerverifiedShow Answer

A charge of 20 nC is distributed uniformly along the x axis from x = −2.0 m to x = +2.0 m. What is the electric potential (relative to zero at infinity) at the point x = 5.0 m on the x axis?

Correct AnswerverifiedShow Answer

An uncharged metal sphere is placed on an insulating puck on a frictionless table. While being held parallel to the table, a rod with a charge q is brought close to the sphere, but does not touch it. As the rod is brought in, the sphere

Correct AnswerverifiedShow Answer

Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential energy from most positive to most negative when traveling from A to B.

Correct AnswerverifiedShow Answer

The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10−10 m. The electric potential created by the electron at the position of the proton is

Correct AnswerverifiedShow Answer

A proton (mass = 1.67 × 10−27 kg, charge = 1.60 × 10−19 C) moves from point A to point B under the influence of an electrostatic force only. At point A the proton moves with a speed of 60 km/s. At point B the speed of the proton is 80 km/s. Determine the potential difference VB − VA.

Correct AnswerverifiedShow Answer

A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m3. What is the magnitude of the potential difference between the center and a point 4.0 cm away?

Correct AnswerverifiedShow Answer

When introduced into a region where an electric field is present, a proton with initial velocity will eventually move

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

The gap between electrodes in a spark plug is 0.06 cm. In order to produce an electric spark in a gasoline-air mixture, the electric field must reach a value of 3 × 10⁶ V/m. What minimum voltage must be supplied by the ignition circuit when starting the car?

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a₀ = 0.529 × 10−¹⁰ m. The electric potential created by the electron at the position of the proton is

Correct Answer
verified

Correct Answer
verified

A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m³. What is the magnitude of the potential difference between the center and a point 4.0 cm away?

Correct Answer
verified

Correct Answer
verified