Question 1

A 3.7 pC charge experiences a force of 8.1 $\times$ 10-7 N in an electric field.What is the magnitude of the electric field?

Accepted Answer

A)  3.00 $\times$ 105 N/C 
B)  2.2 $\times$ 105 N/C 
C)  4.3 $\times$ 10-6 N/C 
D)  12 N/C 
E)  1.2 $\times$ 10-3 N/C 
A)  3.00 $\times$ 105 N/C 
B)  2.2 $\times$ 105 N/C 
C)  4.3 $\times$ 10-6 N/C 
D)  12 N/C 
E)  1.2 $\times$ 10-3 N/C

Question 2

What is the total electric flux through a closed surface containing a 2.0 $ \mu$C charge?

Accepted Answer

A)  1.8 $\times$ 104 N·m2/C 
B)  2.3 $\times$ 105 N·m2/C 
C)  1.4 $\times$ 105 N·m2/C 
D)  4.5 $\times$ 103 N·m2/C 
E)  0 
A)  1.8 $\times$ 104 N·m2/C 
B)  2.3 $\times$ 105 N·m2/C 
C)  1.4 $\times$ 105 N·m2/C 
D)  4.5 $\times$ 103 N·m2/C 
E)  0

Question 3

A linear charge distribution has a charge per unit length of 2.3 $\times$ 10-6 C/m.What is the magnitude of the electric field at a perpendicular distance of 0.50 m from the line charge?

Accepted Answer

A)  0.19 N/C 
B)  0.38 N/C 
C)  1.1 $\times$ 102 N/C 
D)  1.7 $\times$ 104 N/C 
E)  8.3 $\times$ 104 N/C 
A)  0.19 N/C 
B)  0.38 N/C 
C)  1.1 $\times$ 102 N/C 
D)  1.7 $\times$ 104 N/C 
E)  8.3 $\times$ 104 N/C

Question 4

A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 $ \mu$C placed on it.At the center of the shell is placed a point charge of 2.00 $ \mu$C.What is the electric field at a distance of 30.0 cm from the center of the spherical shell?

Accepted Answer

A)  6.0 $\times$ 105 N/C outward 
B)  2.0 $\times$ 105 N/C outward 
C)  4.0 $\times$ 105 N/C inward 
D)  4.0 $\times$ 105 N/C outward 
E)  0.0 
A)  6.0 $\times$ 105 N/C outward 
B)  2.0 $\times$ 105 N/C outward 
C)  4.0 $\times$ 105 N/C inward 
D)  4.0 $\times$ 105 N/C outward 
E)  0.0

Question 5

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

Accepted Answer

A)  0.024 $ \mu$g 
B)  0.010 $ \mu$g 
C)  0.031 $ \mu$g 
D)  0.072 $ \mu$g 
A)  0.024 $ \mu$g 
B)  0.010 $ \mu$g 
C)  0.031 $ \mu$g 
D)  0.072 $ \mu$g

Question 6

The word electric comes from the Greek word for

Accepted Answer

A)  wool. 
B)  amber. 
C)  silk. 
D)  glass. 
E)  lodestone. 
A)  wool. 
B)  amber. 
C)  silk. 
D)  glass. 
E)  lodestone.

Question 7

How many electrons does it take to make one coulomb of negative charge?

Accepted Answer

A)  1.00 $\times$ 109 
B)  6.25 $\times$ 1018 
C)  6.02 $\times$ 1023 
D)  1.66 $\times$ 1018 
E)  2.24 $\times$ 104 
A)  1.00 $\times$ 109 
B)  6.25 $\times$ 1018 
C)  6.02 $\times$ 1023 
D)  1.66 $\times$ 1018 
E)  2.24 $\times$ 104

Question 8

If a neutral metal object has been charged by friction to a charge of one pC,what has happened to it electrically?

Accepted Answer

A)  6.25 $\times$ 106 electrons have been added to it 
B)  6.25 $\times$  106 protons have been added to it 
C)  6.25 $\times$  106 electrons have been removed from it 
D)  6.25 $\times$  106 protons have been removed from it 
E)  6.25 $\times$  106 electrons and protons have been added to it 
A)  6.25 $\times$ 106 electrons have been added to it 
B)  6.25 $\times$  106 protons have been added to it 
C)  6.25 $\times$  106 electrons have been removed from it 
D)  6.25 $\times$  106 protons have been removed from it 
E)  6.25 $\times$  106 electrons and protons have been added to it

Question 9

What is the magnitude of the acceleration of an electron when in an electric field of 7.0 $\times$ 104 N/C?

Accepted Answer

A)  3.0 $\times$ 108 m/s2 
B)  1.2 $\times$ 1016 m/s2 
C)  7.7 $\times$ 1034 m/s2 
D)  8.6 $\times$ 1020.00 m/s2 
E)  7.0 $\times$ 104 m/s2 
A)  3.0 $\times$ 108 m/s2 
B)  1.2 $\times$ 1016 m/s2 
C)  7.7 $\times$ 1034 m/s2 
D)  8.6 $\times$ 1020.00 m/s2 
E)  7.0 $\times$ 104 m/s2

Question 10

The symbols $\rho$,$\lambda$,and $\sigma$ are used to represent,respectively,the charge density per unit

Accepted Answer

A)  length,volume,and area. 
B)  volume,length,and area. 
C)  area,volume,and length. 
D)  volume,area,and length. 
E)  area,length,and volume. 
A)  length,volume,and area. 
B)  volume,length,and area. 
C)  area,volume,and length. 
D)  volume,area,and length. 
E)  area,length,and volume.

Question 11

Each atom in a 7.0 microgram piece of calcium (A = 40,Z = 20)has one electron removed.What is the total charge collected in this way?

Accepted Answer

A)  34 mC 
B)  670 mC 
C)  17 mC 
D)  60 mC 
A)  34 mC 
B)  670 mC 
C)  17 mC 
D)  60 mC

Question 12

A conducting sphere of radius 10.0 cm holds a net charge of 4.4 $ \mu$C.What is the surface charge density?

Accepted Answer

A)  0.0 
B)  3.5 $\times$ 10-5 C/m2 
C)  1.1 $\times$ 10-5 C/m2 
D)  2.2 $\times$ 10-4 C/m2 
E)  5.6 $\times$ 10-3 C/m2 
A)  0.0 
B)  3.5 $\times$ 10-5 C/m2 
C)  1.1 $\times$ 10-5 C/m2 
D)  2.2 $\times$ 10-4 C/m2 
E)  5.6 $\times$ 10-3 C/m2

Question 13

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.Which charge is subjected to the force of greatest magnitude?

Accepted Answer

A)  q1 
B)  q2 
C)  q3 
D)  q1 and q2 (equal) 
E)  q2 and q3 (equal) 
A)  q1 
B)  q2 
C)  q3 
D)  q1 and q2 (equal) 
E)  q2 and q3 (equal)

Question 14

Increasing the distance from a point charge by 34% changes the magnitude of the electric field by what amount?

Accepted Answer

A)  it decreases by 16% 
B)  it decreases by 34% 
C)  it decreases by 44% 
D)  it decreases by 80% 
E)  it stays the same 
A)  it decreases by 16% 
B)  it decreases by 34% 
C)  it decreases by 44% 
D)  it decreases by 80% 
E)  it stays the same

Question 15

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 magnitude of the electric field at x = 7.5 m?

Accepted Answer

A)  4.0 $\times$ 105 N/C 
B)  3.8 $\times$ 104 N/C 
C)  5.7 $\times$ 105 N/C 
D)  6.3 $\times$ 104 N/C 
E)  2.5 $\times$ 106 N/C 
A)  4.0 $\times$ 105 N/C 
B)  3.8 $\times$ 104 N/C 
C)  5.7 $\times$ 105 N/C 
D)  6.3 $\times$ 104 N/C 
E)  2.5 $\times$ 106 N/C

Question 16

Two alpha particles (helium nuclei)are separated by 4.0 $\times$ 10-15 m.What is the magnitude of the force between the particles due to their charge?

Accepted Answer

A)  6.8 $\times$ 10-22 N 
B)  4.5 $\times$ 10-19 N 
C)  1.1 $\times$ 10-4 N 
D)  14 N 
E)  58 N 
A)  6.8 $\times$ 10-22 N 
B)  4.5 $\times$ 10-19 N 
C)  1.1 $\times$ 10-4 N 
D)  14 N 
E)  58 N

Question 17

The electron orbiting the proton in the hydrogen atom is at a distance of 5.3 $\times$ 10-9 m.What is the magnitude of the electric force between the proton and the electron?

Accepted Answer

A)  1.6 $\times$ 10-19 N 
B)  2.7 $\times$ 102 N 
C)  4.3 $\times$ 10-17 N 
D)  8.2 $\times$ 10-12 N 
E)  2.7 $\times$ 10-2 N 
A)  1.6 $\times$ 10-19 N 
B)  2.7 $\times$ 102 N 
C)  4.3 $\times$ 10-17 N 
D)  8.2 $\times$ 10-12 N 
E)  2.7 $\times$ 10-2 N

Question 18

When the perpendicular distance from a linear charge distribution is tripled,what happens to the electric field strength?

Accepted Answer

A)  it stays the same 
B)  it decreases by a factor of 3 
C)  it decreases by a factor of 9 
D)  it decreases by a factor of (3)1/2 
E)  it increases by a factor of (3)1/2 
A)  it stays the same 
B)  it decreases by a factor of 3 
C)  it decreases by a factor of 9 
D)  it decreases by a factor of (3)1/2 
E)  it increases by a factor of (3)1/2

Question 19

A horizontally-projected beam of electrons travelling at 55 km/s travels between two parallel plates between which there is an electric field.The beam travels exactly horizontally the whole time it is between the plates.What does this imply about the electric field between the plates?

Accepted Answer

A)  It is 0. 
B)  It is 56 pV/m upward. 
C)  It is 56 pV/m downward. 
D)  It doesn't imply anything in particular. 
A)  It is 0. 
B)  It is 56 pV/m upward. 
C)  It is 56 pV/m downward. 
D)  It doesn't imply anything in particular.

Question 20

Pure water is classified as

Accepted Answer

A)  an insulator. 
B)  a conductor. 
C)  a semiconductor. 
D)  all of these choices are correct 
E)  none of these choices are correct 
A)  an insulator. 
B)  a conductor. 
C)  a semiconductor. 
D)  all of these choices are correct 
E)  none of these choices are correct

Exam 16: Electric Forces and Fields

A 3.7 pC charge experiences a force of 8.1 ×\times× 10-7 N in an electric field.What is the magnitude of the electric field?

What is the total electric flux through a closed surface containing a 2.0 μ \muμ C charge?

A linear charge distribution has a charge per unit length of 2.3 ×\times× 10-6 C/m.What is the magnitude of the electric field at a perpendicular distance of 0.50 m from the line charge?

A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 μ \muμ C placed on it.At the center of the shell is placed a point charge of 2.00 μ \muμ C.What is the electric field at a distance of 30.0 cm from the center of the spherical shell?

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

The word electric comes from the Greek word for

How many electrons does it take to make one coulomb of negative charge?

If a neutral metal object has been charged by friction to a charge of one pC,what has happened to it electrically?

What is the magnitude of the acceleration of an electron when in an electric field of 7.0 ×\times× 104 N/C?

The symbols ρ\rhoρ , λ\lambdaλ ,and σ\sigmaσ are used to represent,respectively,the charge density per unit

Each atom in a 7.0 microgram piece of calcium (A = 40,Z = 20)has one electron removed.What is the total charge collected in this way?

A conducting sphere of radius 10.0 cm holds a net charge of 4.4 μ \muμ C.What is the surface charge density?

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.Which charge is subjected to the force of greatest magnitude?

Increasing the distance from a point charge by 34% changes the magnitude of the electric field by what amount?

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 magnitude of the electric field at x = 7.5 m?

Two alpha particles (helium nuclei)are separated by 4.0 ×\times× 10-15 m.What is the magnitude of the force between the particles due to their charge?

The electron orbiting the proton in the hydrogen atom is at a distance of 5.3 ×\times× 10-9 m.What is the magnitude of the electric force between the proton and the electron?

When the perpendicular distance from a linear charge distribution is tripled,what happens to the electric field strength?

A horizontally-projected beam of electrons travelling at 55 km/s travels between two parallel plates between which there is an electric field.The beam travels exactly horizontally the whole time it is between the plates.What does this imply about the electric field between the plates?

Pure water is classified as

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A 3.7 pC charge experiences a force of 8.1 $\times$ 10^-7 N in an electric field.What is the magnitude of the electric field?

What is the total electric flux through a closed surface containing a 2.0 $\mu$ C charge?

A linear charge distribution has a charge per unit length of 2.3 $\times$ 10^-6 C/m.What is the magnitude of the electric field at a perpendicular distance of 0.50 m from the line charge?

A thin metallic spherical shell of radius 50 cm has a total charge of 4.0 $\mu$ C placed on it.At the center of the shell is placed a point charge of 2.00 $\mu$ C.What is the electric field at a distance of 30.0 cm from the center of the spherical shell?

What is the magnitude of the acceleration of an electron when in an electric field of 7.0 $\times$ 10⁴ N/C?

The symbols $\rho$ , $\lambda$ ,and $\sigma$ are used to represent,respectively,the charge density per unit

A conducting sphere of radius 10.0 cm holds a net charge of 4.4 $\mu$ C.What is the surface charge density?

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.Which charge is subjected to the force of greatest magnitude?

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 magnitude of the electric field at x = 7.5 m?

Two alpha particles (helium nuclei)are separated by 4.0 $\times$ 10^-15 m.What is the magnitude of the force between the particles due to their charge?

The electron orbiting the proton in the hydrogen atom is at a distance of 5.3 $\times$ 10^-9 m.What is the magnitude of the electric force between the proton and the electron?