Question 1

An arrangement of 3 charges is drawn showing the field lines.The first charge has 20 lines going into it.The second charge has 30 lines going out of it.If the net charge of the arrangement is zero,what is the field line situation for the third charge?

Accepted Answer

A)   50 lines going out
B)   50 lines going in
C)   10 lines going out
D)   10 lines going in
E)   600 lines going out to infinityF) A) and E)
G) C) and D)

Question 2

A 4.7 cm radius spherical conducting shell has a uniform surface charge density.What is the density if the electric field 1.5 m from its center is 17 N/C outward?

Accepted Answer

A)   1.5  ×	imes×  10-7 C/m2
B)   7.6  ×	imes×  10-6 C/m2
C)   1.1  ×	imes×  10-7 C/m2
D)   1.5  ×	imes×  10-9 C/m2
E)   6.1  ×	imes×  10-7 C/m2 F) None of the above
G) B) and E)

Question 3

Three point charges are located on the x-axis.The first charge,q1 = 10.0  μ \muμ C, is at x = -1.00 m; the second charge, q2 = 20.0  μ \muμ C, is at the origin; and the third charge,q3 = -30.0  μ \muμ C, is located at x = 2.00 m.What is the force on q2?

Accepted Answer

A)   1.65 N in the negative x-direction
B)   3.15 N in the positive x-direction
C)   1.50 N in the negative x-direction
D)   4.80 N in the positive x-direction
E)   4.65 N in the negative x-direction F) A) and B)
G) B) and D)

Question 4

When rubbing two insulators together,the one that gets a positive charge has had

Accepted Answer

A)   protons added.
B)   protons removed.
C)   electrons added.
D)   electrons removed.
E)   electrons added and protons removed.F) C) and D)
G) A) and E)

Question 5

Electrons are collected by removing them from the atoms in a sample of water vapor (H2O,molecular mass 18u) .If every hydrogen atom has lost an electron in the process,what is the mass of the sample if a charge of exactly 1.0 C was collected?

Accepted Answer

A)   62  μ \muμ g
B)   370  μ \muμ g
C)   93  μ \muμ g
D)   180  μ \muμ g E) B) and D)
F) None of the above

Question 6

What is the magnitude of the electric field 30.0 cm from a point charge of 0.35  μ \muμ C?

Accepted Answer

A)   1.2  ×	imes×  10-2 N/C
B)   9.5  ×	imes×  10-4 N/C
C)   9.5  ×	imes×  104 N/C
D)   3.5  ×	imes×  104 N/C
E)   1.1  ×	imes×  104 N/C F) A) and B)
G) B) and D)

Question 7

Each atom in a sample of lithium (Z = 3,atomic mass 6.941 u) has all of its electrons removed.If exactly 1.0 C was collected in this way,what is the mass of the lithium sample?

Accepted Answer

A)   0.010  μ \muμ g
B)   0.024  μ \muμ g
C)   0.031  μ \muμ g
D)   0.072  μ \muμ g E) B) and D)
F) None of the above

Question 8

Each atom in a mole of water vapor (H2O) has one electron removed.What is the total charge of the ionized gas?

Accepted Answer

A)   96 kC
B)   290 kC
C)   600 kC
D)   190 kCE) A) and B)
F) B) and C)

Question 9

Consider a point charge and an imaginary spherical surface surrounding it.Which of the following situations would bring about a change in the electrical flux through the surface

Accepted Answer

A)   Exchanging the spherical surface for a cylindrical surface that still contains the original point charge
B)   Bringing a second point charge nearby,but outside the surface
C)   Moving the point charge to a point not in the center of the spherical surface
D)   Bringing a second point charge nearby,and within the surfaceE) A) and B)
F) C) and D)

Question 10

Three point charges are located on the x-axis.The first charge,q1 = 10.0  μ \muμ C, is at x = -1.00 m; the second charge, q2 = 20.0  μ \muμ C,is at the origin; and the third charge,q3 = -30.0  μ \muμ C, is located at x = 2.00 m.What is the force on q3?

Accepted Answer

A)   1.65 N in the negative x-direction
B)   3.15 N in the positive x-direction
C)   1.50 N in the negative x-direction
D)   4.80 N in the positive x-direction
E)   4.65 N in the negative x-direction F) A) and B)
G) A) and C)

Question 11

Electric field lines symbolize

Accepted Answer

A)   The force a positive charge would experience at the location of the line
B)   The path a positive charge would take if released at rest on one of the lines
C)   The distribution of electric charges in space
D)   Boundaries between regions of positive and negative chargeE) A) and D)
F) B) and C)

Question 12

Arrange the following from smallest to largest.

Accepted Answer

A)   mC, μ \muμ C,nC,pC
B)    μ \muμ C,mC,pC,nC
C)   nC,pC,mC, μ \muμ C
D)   pC,nC, μ \muμ C,mC
E)   nC,pC, μ \muμ C,mC F) A) and D)
G) A) and E)

Question 13

An electron is fired through a pair of deflection plates,which produce a 2.00 cm long region with an electric field of 4000 N/C perpendicular to the electron's initial velocity.If the initial speed of the electron is 1.00  ×	imes×  107 m/s,what is its new component of velocity after going through the deflection plates?

Accepted Answer

A)   2.0  ×	imes×  107 m/s
B)   7.1  ×	imes×  106 m/s
C)   2.8  ×	imes×  106 m/s
D)   1.4  ×	imes×  106 m/s
E)   6.5  ×	imes×  104 m/s F) D) and E)
G) A) and B)

Question 14

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.What is the acceleration of the electrons while in this electric field?

Accepted Answer

A)   1.4  ×	imes×  108 m/s2
B)   2.6  ×	imes×  1011 m/s2
C)   1.4  ×	imes×  1012 m/s2
D)   2.6  ×	imes×  1015 m/s2
E)   3.0  ×	imes×  108 m/s2 F) A) and E)
G) A) and C)

Question 15

A hollow conducting spherical shell of radius 1.20 cm carries a charge of -5.20 nC.What is the electric field at a distance of 1.50 cm from the center of the shell?

Accepted Answer

A)   1.03  ×	imes×  106 N/C outward
B)   0 N/C
C)   2.08  ×	imes×  105 N/C inward
D)   2.08  ×	imes×  105 N/C outward
E)   1.03  ×	imes×  106 N/C inward F) C) and D)
G) B) and E)

Question 16

In a diagram of electric field lines,what is represented by lines that are drawn closer together?

Accepted Answer

A)   a more positive field
B)   a more negative field
C)   a stronger field
D)   a weaker field
E)   nothing (artistic license) F) B) and D)
G) A) and B)

Question 17

When an object is polarized,it

Accepted Answer

A)   must contain more positive charge than negative charge.
B)   must contain more negative charge than positive charge.
C)   will have a separation of positive and negative charge.
D)   must be illuminated by polarized light.
E)   must be made of metal.F) A) and E)
G) A) and D)

Question 18

Two charges are separated by a distance d.If one the charges is doubled while the other is tripled,what happens to the force between the charges?

Accepted Answer

A)   it increases by a factor of 5
B)   it increases by a factor of 6
C)   it increases by a factor of 12
D)   it increases by a factor of 18
E)   it increases by a factor of 36F) B) and C)
G) A) and D)

Question 19

A proton is moving in an electric field.The direction of the acceleration of the proton is

Accepted Answer

A)   in the direction the proton is moving.
B)   opposite the direction the proton is moving.
C)   perpendicular to the direction the proton is moving.
D)   in the direction of the electric field.
E)   opposite the direction of the electric field.F) A) and B)
G) D) and E)

Question 20

An electrically neutral metal sphere hangs from an insulating thread.A charged glass wand is brought near to the sphere.Describe what occurs next:

Accepted Answer

A)   The sphere is attracted to the wand
B)   The sphere is neither attracted nor repelled,since it is electrically neutral
C)   The sphere is repelled by the wand
D)   The sphere will become chargedE) None of the above
F) All of the above

Exam 16: Electric Forces and Fields

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.What is the acceleration of the electrons while in this electric field?

Correct Answer
verified

Each atom in a mole of water vapor (H₂O) has one electron removed.What is the total charge of the ionized gas?

Correct Answer
verified

Electrons are collected by removing them from the atoms in a sample of water vapor (H₂O,molecular mass 18u) .If every hydrogen atom has lost an electron in the process,what is the mass of the sample if a charge of exactly 1.0 C was collected?

Correct Answer
verified

Electric field lines symbolize

Correct Answer
verified

A hollow conducting spherical shell of radius 1.20 cm carries a charge of -5.20 nC.What is the electric field at a distance of 1.50 cm from the center of the shell?

Correct Answer
verified

An arrangement of 3 charges is drawn showing the field lines.The first charge has 20 lines going into it.The second charge has 30 lines going out of it.If the net charge of the arrangement is zero,what is the field line situation for the third charge?

Correct Answer
verified

Consider a point charge and an imaginary spherical surface surrounding it.Which of the following situations would bring about a change in the electrical flux through the surface

Correct Answer
verified

In a diagram of electric field lines,what is represented by lines that are drawn closer together?

Correct Answer
verified

An electrically neutral metal sphere hangs from an insulating thread.A charged glass wand is brought near to the sphere.Describe what occurs next:

Correct Answer
verified

When rubbing two insulators together,the one that gets a positive charge has had

Correct Answer
verified

Arrange the following from smallest to largest.

Correct Answer
verified

Correct Answer
verified

Three point charges are located on the x-axis.The first charge,q₁ = 10.0 $\mu$ C, is at x = -1.00 m; the second charge, q₂ = 20.0 $\mu$ C,is at the origin; and the third charge,q₃ = -30.0 $\mu$ C, is located at x = 2.00 m.What is the force on q₃?

Correct Answer
verified

What is the magnitude of the electric field 30.0 cm from a point charge of 0.35 $\mu$ C?

Correct Answer
verified

When an object is polarized,it

Correct Answer
verified

Each atom in a sample of lithium (Z = 3,atomic mass 6.941 u) has all of its electrons removed.If exactly 1.0 C was collected in this way,what is the mass of the lithium sample?

Correct Answer
verified

A proton is moving in an electric field.The direction of the acceleration of the proton is

Correct Answer
verified

Two charges are separated by a distance d.If one the charges is doubled while the other is tripled,what happens to the force between the charges?

Correct Answer
verified

A 4.7 cm radius spherical conducting shell has a uniform surface charge density.What is the density if the electric field 1.5 m from its center is 17 N/C outward?

Correct Answer
verified

Three point charges are located on the x-axis.The first charge,q₁ = 10.0 $\mu$ C, is at x = -1.00 m; the second charge, q₂ = 20.0 $\mu$ C, is at the origin; and the third charge,q₃ = -30.0 $\mu$ C, is located at x = 2.00 m.What is the force on q₂?

Correct Answer
verified

Exam 16: Electric Forces and Fields

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.What is the acceleration of the electrons while in this electric field?

Correct AnswerverifiedShow Answer

Each atom in a mole of water vapor (H2O) has one electron removed.What is the total charge of the ionized gas?

Correct AnswerverifiedShow Answer

Electrons are collected by removing them from the atoms in a sample of water vapor (H2O,molecular mass 18u) .If every hydrogen atom has lost an electron in the process,what is the mass of the sample if a charge of exactly 1.0 C was collected?

Correct AnswerverifiedShow Answer

Electric field lines symbolize

Correct AnswerverifiedShow Answer

A hollow conducting spherical shell of radius 1.20 cm carries a charge of -5.20 nC.What is the electric field at a distance of 1.50 cm from the center of the shell?

Correct AnswerverifiedShow Answer

An arrangement of 3 charges is drawn showing the field lines.The first charge has 20 lines going into it.The second charge has 30 lines going out of it.If the net charge of the arrangement is zero,what is the field line situation for the third charge?

Correct AnswerverifiedShow Answer

Consider a point charge and an imaginary spherical surface surrounding it.Which of the following situations would bring about a change in the electrical flux through the surface

Correct AnswerverifiedShow Answer

In a diagram of electric field lines,what is represented by lines that are drawn closer together?

Correct AnswerverifiedShow Answer

An electrically neutral metal sphere hangs from an insulating thread.A charged glass wand is brought near to the sphere.Describe what occurs next:

Correct AnswerverifiedShow Answer

When rubbing two insulators together,the one that gets a positive charge has had

Correct AnswerverifiedShow Answer

Arrange the following from smallest to largest.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Three point charges are located on the x-axis.The first charge,q1 = 10.0 μ \muμ C, is at x = -1.00 m; the second charge, q2 = 20.0 μ \muμ C,is at the origin; and the third charge,q3 = -30.0 μ \muμ C, is located at x = 2.00 m.What is the force on q3?

Correct AnswerverifiedShow Answer

What is the magnitude of the electric field 30.0 cm from a point charge of 0.35 μ \muμ C?

Correct AnswerverifiedShow Answer

When an object is polarized,it

Correct AnswerverifiedShow Answer

Each atom in a sample of lithium (Z = 3,atomic mass 6.941 u) has all of its electrons removed.If exactly 1.0 C was collected in this way,what is the mass of the lithium sample?

Correct AnswerverifiedShow Answer

A proton is moving in an electric field.The direction of the acceleration of the proton is

Correct AnswerverifiedShow Answer

Two charges are separated by a distance d.If one the charges is doubled while the other is tripled,what happens to the force between the charges?

Correct AnswerverifiedShow Answer

A 4.7 cm radius spherical conducting shell has a uniform surface charge density.What is the density if the electric field 1.5 m from its center is 17 N/C outward?

Correct AnswerverifiedShow Answer

Three point charges are located on the x-axis.The first charge,q1 = 10.0 μ \muμ C, is at x = -1.00 m; the second charge, q2 = 20.0 μ \muμ C, is at the origin; and the third charge,q3 = -30.0 μ \muμ C, is located at x = 2.00 m.What is the force on q2?

Correct AnswerverifiedShow Answer

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.What is the acceleration of the electrons while in this electric field?

Correct Answer
verified

Each atom in a mole of water vapor (H₂O) has one electron removed.What is the total charge of the ionized gas?

Correct Answer
verified

Electrons are collected by removing them from the atoms in a sample of water vapor (H₂O,molecular mass 18u) .If every hydrogen atom has lost an electron in the process,what is the mass of the sample if a charge of exactly 1.0 C was collected?

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Three point charges are located on the x-axis.The first charge,q₁ = 10.0 $\mu$ C, is at x = -1.00 m; the second charge, q₂ = 20.0 $\mu$ C,is at the origin; and the third charge,q₃ = -30.0 $\mu$ C, is located at x = 2.00 m.What is the force on q₃?

Correct Answer
verified

What is the magnitude of the electric field 30.0 cm from a point charge of 0.35 $\mu$ C?

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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Three point charges are located on the x-axis.The first charge,q₁ = 10.0 $\mu$ C, is at x = -1.00 m; the second charge, q₂ = 20.0 $\mu$ C, is at the origin; and the third charge,q₃ = -30.0 $\mu$ C, is located at x = 2.00 m.What is the force on q₂?

Correct Answer
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