Question 1

For a conductor in electrostatic equilibrium,which of the following statements is NOT true?

Accepted Answer

A)   the electric field inside the conductor is zero
B)   the charge distributes itself uniformly throughout the conductor
C)   the electric field at the surface of the conductor is perpendicular to the surface of the conductor
D)   the greatest concentrations of charge on the surface are in the regions of highest curvature
E)   more than one of these statements about a conductor in electrostatic equilibrium is falseF) A) and B)
G) All of the above

Question 2

In a diagram of electric field lines,q1 has 9 lines going into it and q2 has 27 lines going out of it.If one of the charges is -40 mC,which of the following could be the other one?

Accepted Answer

A)   -120 mC
B)   18.0 mC
C)   -18.0 mC
D)   120 mC
E)   none of the these choices are correctF) A) and C)
G) A) and E)

Question 3

A 1.00 nC charge is placed on the x-axis at x = - 1.00 m. A second 1.00 nC charge is placed on the x-axis at x = 1.00 m. A third charge of 1.00 nC is placed on the y-axis at y = - 1.00 m. A fourth charge is place on the y-axis at y = 1.00 m. What is the fourth charge if the electric field at the origin is zero?

Accepted Answer

A)   1.00 nC
B)   -1.00 nC
C)   3.00 nC
D)   -3.00 nC
E)   2.00 nCF) C) and D)
G) A) and B) A

Question 4

An electron gun sends electrons through a region with an electric field of 1.5  ×	imes×  104 N/C for a distance of 2.5 cm.If the electrons start from rest,how fast are they moving after traversing the gun?

Accepted Answer

A)   1.1  ×	imes×  104 m/s
B)   1.1  ×	imes×  107 m/s
C)   2.3  ×	imes×  104 m/s
D)   2.3  ×	imes×  107 m/s
E)   2.6  ×	imes×  1015 m/s F) None of the above
G) A) and E)

Question 5

Four point charges are located at the corners of a square,1.00 m by 1.00 m.On each of two diagonally opposite corners are 1.00  μ \muμ C charges.On each of the other two corners are - 1.00  μ \muμ C charges.What is the magnitude of the force on one of the positive charges?

Accepted Answer

A)   8.2  ×	imes×  10-3 N
B)   1.3  ×	imes×  10-2 N
C)   3.2  ×	imes×  10-3 N
D)   1.9  ×	imes×  10-2 N
E)   0.00 F) None of the above
G) A) and D)

Question 6

A long linear charge distribution of charge density 1.35 nC/m is surrounded by a concentric cylindrical surface of length 1.60 m and radius 23.6 cm.What is the electric flux through the surface of the cylinder?

Accepted Answer

A)   0.00
B)   160 N·m2/C
C)   244 N·m2/C
D)   280 N·m2/C
E)   316 N·m2/CF) B) and E)
G) B) and D)

Question 7

Two charges are located on the x-axis. A 22  μ \muμ  C charge is located at the origin and a 47  μ \muμ C charge is located at x = 4.0 m.What is the electric field at x = 3.00 m?

Accepted Answer

A)   4.5  ×	imes×  105 N/C in the positive x-direction
B)   4.9  ×	imes×  105 N/C in the negative x-direction
C)   4.0  ×	imes×  105 N/C in the negative x-direction
D)   4.9  ×	imes×  105 N/C in the positive x-direction
E)   6.3  ×	imes×  105 N/C in the negative x-direction F) B) and D)
G) A) and B)

Question 8

A 72 nC charge is located at x = 3.00 m on the x-axis and an 8.0 nC charge is located at x = 7.0 m.At what point on the x-axis is the electric field zero?

Accepted Answer

A)   - 9.0 m
B)   4.0 m
C)   -5.0 m
D)   6.0 m
E)   6.3 mF) B) and C)
G) None of the above

Question 9

A point charge of 3.00  μ \muμ C is located on the y-axis at y = 4.0 m,another point charge of 6.0  μ \muμ C is located on the x-axis at x = 5.0 m,and a third charge of 7.2  μ \muμ C is located at (5.0 m,4.0 m) .What is the magnitude of the force on the 7.2  μ \muμ C charge?

Accepted Answer

A)   1.2  ×	imes×  10-2 N
B)   1.6  ×	imes×  10-2 N
C)   1.9  ×	imes×  10-2 N
D)   2.6  ×	imes×  10-2 N
E)   3.3  ×	imes×  10-2 N F) C) and D)
G) B) and C)

Question 10

A thin metallic shell of radius 40 cm has a charge of -25 nC on it.At the center of the sphere is a point charge of 35 nC.What is the electric field 15 cm from the center of the shell?

Accepted Answer

A)   2.4  ×	imes×  104 N/C inward
B)   1.4  ×	imes×  104 N/C inward
C)   2.4  ×	imes×  104 N/C outward
D)   1.4  ×	imes×  104 N/C outward
E)   4.0  ×	imes×  104 N/C outward F) A) and B)
G) A) and C)

Question 11

We find from Gauss's law that the flux through a closed surface

Accepted Answer

A)   is proportional to the net charge enclosed.
B)   is inversely proportional to the net charge enclosed.
C)   is proportional to the square root of the charge enclosed.
D)   is zero.
E)   is less the larger the closed surface.F) A) and D)
G) All of the above A

Question 12

If more field lines leave a closed surface than enter that surface,then

Accepted Answer

A)   a net positive charge is contained inside the surface.
B)   a net negative charge is contained inside the surface.
C)   an error has been made since the number of field lines entering a surface must equal those leaving the surface.
D)   an operating electron gun is inside the surface.
E)   there must be a charge on the surface.F) A) and D)
G) A) and C)

Question 13

A thin spherical shell of radius 20.0 cm has 5.0  μ \muμ C of charge uniformly distributed over its surface.What is the magnitude of the electric field 2.00 m from the center of the sphere?

Accepted Answer

A)   2.3  ×	imes×  104 N/C
B)   1.1  ×	imes×  104 N/C
C)   1.4  ×	imes×  103 N/C
D)   2.3  ×	imes×  106 N/C
E)   0 F) A) and B)
G) A) and D)

Question 14

Three point charges are positioned as follows: q1 is at (0.00 m,0.00 m) ,q2 is at (1.20 m,0.00 m) ,and q3 is at (1.20 m,1.60 m) .If q1 = 1.00  μ \muμ C,q2 = 2.00  μ \muμ C,and q3 = 3.00  μ \muμ C,what is the magnitude of the force on q2?

Accepted Answer

A)   2.45  ×	imes×  10-2 N
B)   1.25  ×	imes×  10-2 N
C)   2.11  ×	imes×  10-2 N
D)   3.36  ×	imes×  10-2 N
E)   5.08  ×	imes×  10-2 N F) All of the above
G) A) and E)

Question 15

The Coulomb constant,k,has a value of 8.99  ×	imes×   109 N·m2/C2.The permittivity of free space, εo\varepsilon_{o}εo​ ,has the units

Accepted Answer

A)   N·m2/C2.
B)   N·m/C.
C)   C/(N·m) .
D)   C2/(N·m2) .
E)   that are not given. F) A) and E)
G) B) and D)

Question 16

A horizontally-projected beam of protons travelling at 55 km/s travels between two parallel plates separated by 7.4 cm,and 12 cm long,between which there is an electric field of 7.2 V/m upward.If the beam enters the region at a height of 3.7 cm above the lower plate,at what height above the lower plate is the beam when it exits? The proton mass is 1.67  ×	imes×  10-27 kg.

Accepted Answer

A)   4.4 cm
B)   3.0 cm
C)   5.1 cm
D)   2.3 cm E) All of the above
F) B) and D) A

Question 17

Four point charges are located at the corners of a square,1.00 m by 1.00 m.On each of two diagonally opposite corners are 1.00  μ \muμ C charges.On each of the other two corners are -1.00  μ \muμ C charges.What is the direction of the force on each charge?

Accepted Answer

A)   positive charges away from away from the center of the square,negative inward toward center
B)   negative charges away from away from the center of the square,positive inward toward center
C)   positive and negative charges both toward the center of the square
D)   positive and negative charges both away from the center of the square
E)   no direction (net force = 0)  F) B) and D)
G) None of the above

Question 18

Household wiring is made with

Accepted Answer

A)   conductors inside insulators.
B)   insulators inside conductors.
C)   semiconductors inside conductors.
D)   semiconductors inside insulators.
E)   semiconductors inside insulators inside conductors.F) None of the above
G) A) and E)

Question 19

An imaginary spherical surface has radius 1.5 m.Fully contained within and concentric with the spherical surface is a spherical conductor with a uniform surface charge density of 1.5  ×	imes×  10-7 C/m2.What is its radius if the flux through the imaginary surface is electric field 1.5 m from its center is 480 Nm2/C?

Accepted Answer

A)   3.2 cm
B)   4.7 cm
C)   9.5 cm
D)   6.4 cm
E)   3.9 cm F) All of the above
G) A) and B)

Question 20

A horizontally-projected beam of protons travelling at 55 km/s travels between two parallel plates separated by 7.4 cm,and 12 cm long,between which there is an electric field of 7.2 mV/m upward.If the beam enters the region at exactly midway vertically between the plates,and exits the region 7.2 microns closer to the lower plate,where relative to the lower plate would a beam of electrons - injected into the region at the same location - exit? The proton mass is 1.67   ×	imes×  10-27 kg and that of the electron is 9.11  ×	imes×  10-31 kg.

Accepted Answer

A)   0.9 cm
B)   5.1 cm
C)   2.3 cm
D)   4.6 cm E) A) and D)
F) A) and C)

Exam 16: Electric Forces and Fields

For a conductor in electrostatic equilibrium,which of the following statements is NOT true?

Correct Answer
verified

In a diagram of electric field lines,q₁ has 9 lines going into it and q₂ has 27 lines going out of it.If one of the charges is -40 mC,which of the following could be the other one?

Correct Answer
verified

Correct Answer
verified
A

An electron gun sends electrons through a region with an electric field of 1.5 $\times$ 10⁴ N/C for a distance of 2.5 cm.If the electrons start from rest,how fast are they moving after traversing the gun?

Correct Answer
verified

Four point charges are located at the corners of a square,1.00 m by 1.00 m.On each of two diagonally opposite corners are 1.00 $\mu$ C charges.On each of the other two corners are - 1.00 $\mu$ C charges.What is the magnitude of the force on one of the positive charges?

Correct Answer
verified

A long linear charge distribution of charge density 1.35 nC/m is surrounded by a concentric cylindrical surface of length 1.60 m and radius 23.6 cm.What is the electric flux through the surface of the cylinder?

Correct Answer
verified

Two charges are located on the x-axis. A 22 $\mu$ C charge is located at the origin and a 47 $\mu$ C charge is located at x = 4.0 m.What is the electric field at x = 3.00 m?

Correct Answer
verified

A 72 nC charge is located at x = 3.00 m on the x-axis and an 8.0 nC charge is located at x = 7.0 m.At what point on the x-axis is the electric field zero?

Correct Answer
verified

A point charge of 3.00 $\mu$ C is located on the y-axis at y = 4.0 m,another point charge of 6.0 $\mu$ C is located on the x-axis at x = 5.0 m,and a third charge of 7.2 $\mu$ C is located at (5.0 m,4.0 m) .What is the magnitude of the force on the 7.2 $\mu$ C charge?

Correct Answer
verified

A thin metallic shell of radius 40 cm has a charge of -25 nC on it.At the center of the sphere is a point charge of 35 nC.What is the electric field 15 cm from the center of the shell?

Correct Answer
verified

We find from Gauss's law that the flux through a closed surface

Correct Answer
verified
A

If more field lines leave a closed surface than enter that surface,then

Correct Answer
verified

A thin spherical shell of radius 20.0 cm has 5.0 $\mu$ C of charge uniformly distributed over its surface.What is the magnitude of the electric field 2.00 m from the center of the sphere?

Correct Answer
verified

Three point charges are positioned as follows: q₁ is at (0.00 m,0.00 m) ,q₂ is at (1.20 m,0.00 m) ,and q₃ is at (1.20 m,1.60 m) .If q₁ = 1.00 $\mu$ C,q₂ = 2.00 $\mu$ C,and q₃ = 3.00 $\mu$ C,what is the magnitude of the force on q₂?

Correct Answer
verified

The Coulomb constant,k,has a value of 8.99 $\times$ 10⁹ N·m²/C².The permittivity of free space, $\varepsilon_{o}$ ,has the units

Correct Answer
verified

Correct Answer
verified
A

Four point charges are located at the corners of a square,1.00 m by 1.00 m.On each of two diagonally opposite corners are 1.00 $\mu$ C charges.On each of the other two corners are -1.00 $\mu$ C charges.What is the direction of the force on each charge?

Correct Answer
verified

Household wiring is made with

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Exam 16: Electric Forces and Fields

For a conductor in electrostatic equilibrium,which of the following statements is NOT true?

Correct AnswerverifiedShow Answer

In a diagram of electric field lines,q1 has 9 lines going into it and q2 has 27 lines going out of it.If one of the charges is -40 mC,which of the following could be the other one?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

An electron gun sends electrons through a region with an electric field of 1.5 ×\times× 104 N/C for a distance of 2.5 cm.If the electrons start from rest,how fast are they moving after traversing the gun?

Correct AnswerverifiedShow Answer

Four point charges are located at the corners of a square,1.00 m by 1.00 m.On each of two diagonally opposite corners are 1.00 μ \muμ C charges.On each of the other two corners are - 1.00 μ \muμ C charges.What is the magnitude of the force on one of the positive charges?

Correct AnswerverifiedShow Answer

A long linear charge distribution of charge density 1.35 nC/m is surrounded by a concentric cylindrical surface of length 1.60 m and radius 23.6 cm.What is the electric flux through the surface of the cylinder?

Correct AnswerverifiedShow Answer

Two charges are located on the x-axis. A 22 μ \muμ C charge is located at the origin and a 47 μ \muμ C charge is located at x = 4.0 m.What is the electric field at x = 3.00 m?

Correct AnswerverifiedShow Answer

A 72 nC charge is located at x = 3.00 m on the x-axis and an 8.0 nC charge is located at x = 7.0 m.At what point on the x-axis is the electric field zero?

Correct AnswerverifiedShow Answer

A point charge of 3.00 μ \muμ C is located on the y-axis at y = 4.0 m,another point charge of 6.0 μ \muμ C is located on the x-axis at x = 5.0 m,and a third charge of 7.2 μ \muμ C is located at (5.0 m,4.0 m) .What is the magnitude of the force on the 7.2 μ \muμ C charge?

Correct AnswerverifiedShow Answer

A thin metallic shell of radius 40 cm has a charge of -25 nC on it.At the center of the sphere is a point charge of 35 nC.What is the electric field 15 cm from the center of the shell?

Correct AnswerverifiedShow Answer

We find from Gauss's law that the flux through a closed surface

Correct AnswerverifiedA

If more field lines leave a closed surface than enter that surface,then

Correct AnswerverifiedShow Answer

A thin spherical shell of radius 20.0 cm has 5.0 μ \muμ C of charge uniformly distributed over its surface.What is the magnitude of the electric field 2.00 m from the center of the sphere?

Correct AnswerverifiedShow Answer

Three point charges are positioned as follows: q1 is at (0.00 m,0.00 m) ,q2 is at (1.20 m,0.00 m) ,and q3 is at (1.20 m,1.60 m) .If q1 = 1.00 μ \muμ C,q2 = 2.00 μ \muμ C,and q3 = 3.00 μ \muμ C,what is the magnitude of the force on q2?

Correct AnswerverifiedShow Answer

The Coulomb constant,k,has a value of 8.99 ×\times× 109 N·m2/C2.The permittivity of free space, εo\varepsilon_{o}εo​ ,has the units

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

Four point charges are located at the corners of a square,1.00 m by 1.00 m.On each of two diagonally opposite corners are 1.00 μ \muμ C charges.On each of the other two corners are -1.00 μ \muμ C charges.What is the direction of the force on each charge?

Correct AnswerverifiedShow Answer

Household wiring is made with

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct Answer
verified

In a diagram of electric field lines,q₁ has 9 lines going into it and q₂ has 27 lines going out of it.If one of the charges is -40 mC,which of the following could be the other one?

Correct Answer
verified

Correct Answer
verified
A

An electron gun sends electrons through a region with an electric field of 1.5 $\times$ 10⁴ N/C for a distance of 2.5 cm.If the electrons start from rest,how fast are they moving after traversing the gun?

Correct Answer
verified

Four point charges are located at the corners of a square,1.00 m by 1.00 m.On each of two diagonally opposite corners are 1.00 $\mu$ C charges.On each of the other two corners are - 1.00 $\mu$ C charges.What is the magnitude of the force on one of the positive charges?

Correct Answer
verified

Correct Answer
verified

Two charges are located on the x-axis. A 22 $\mu$ C charge is located at the origin and a 47 $\mu$ C charge is located at x = 4.0 m.What is the electric field at x = 3.00 m?

Correct Answer
verified

Correct Answer
verified

A point charge of 3.00 $\mu$ C is located on the y-axis at y = 4.0 m,another point charge of 6.0 $\mu$ C is located on the x-axis at x = 5.0 m,and a third charge of 7.2 $\mu$ C is located at (5.0 m,4.0 m) .What is the magnitude of the force on the 7.2 $\mu$ C charge?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified

A thin spherical shell of radius 20.0 cm has 5.0 $\mu$ C of charge uniformly distributed over its surface.What is the magnitude of the electric field 2.00 m from the center of the sphere?

Correct Answer
verified

Three point charges are positioned as follows: q₁ is at (0.00 m,0.00 m) ,q₂ is at (1.20 m,0.00 m) ,and q₃ is at (1.20 m,1.60 m) .If q₁ = 1.00 $\mu$ C,q₂ = 2.00 $\mu$ C,and q₃ = 3.00 $\mu$ C,what is the magnitude of the force on q₂?

Correct Answer
verified

The Coulomb constant,k,has a value of 8.99 $\times$ 10⁹ N·m²/C².The permittivity of free space, $\varepsilon_{o}$ ,has the units

Correct Answer
verified

Correct Answer
verified
A

Four point charges are located at the corners of a square,1.00 m by 1.00 m.On each of two diagonally opposite corners are 1.00 $\mu$ C charges.On each of the other two corners are -1.00 $\mu$ C charges.What is the direction of the force on each charge?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified