Question 1

Experimenter A uses a test charge q0 and experimenter B uses a test charge 2q0 to measure an electric field produced by stationary charges. A finds a field that is:

Accepted Answer

A)  the same as the field found by B 
B)  greater than the field found by B 
C)  less than the field found by B 
D)  either greater or less than the field found by B, depending on the masses of the test charges 
E)  either greater or less than the field found by B, depending on the accelerations of the test charges 
A)  the same as the field found by B 
B)  greater than the field found by B 
C)  less than the field found by B 
D)  either greater or less than the field found by B, depending on the masses of the test charges 
E)  either greater or less than the field found by B, depending on the accelerations of the test charges A

Question 2

The units of the electric field are:

Accepted Answer

A)  N. C2 
B)  C/N 
C)  N 
D)  N/C 
E)  C/m2 
A)  N. C2 
B)  C/N 
C)  N 
D)  N/C 
E)  C/m2 D

Question 3

The force exerted by a uniform electric field on a dipole is:

Accepted Answer

A)  parallel to the dipole moment 
B)  perpendicular to the dipole moment 
C)  parallel to the electric field 
D)  perpendicular to the electric field 
E)  none of the above 
A)  parallel to the dipole moment 
B)  perpendicular to the dipole moment 
C)  parallel to the electric field 
D)  perpendicular to the electric field 
E)  none of the above E

Question 4

A charged particle is placed in an electric field that varies with location. No force is exerted on this charge:

Accepted Answer

A)  at locations where the electric field is zero 
B)  at locations where the electric field strength is 1/(1.6 * 10-19) N/C 
C)  if the particle is moving along a field line 
D)  if the particle is moving perpendicular to a field line 
E)  if the field is caused by an equal amount of positive and negative charge 
A)  at locations where the electric field is zero 
B)  at locations where the electric field strength is 1/(1.6 * 10-19) N/C 
C)  if the particle is moving along a field line 
D)  if the particle is moving perpendicular to a field line 
E)  if the field is caused by an equal amount of positive and negative charge

Question 5

An isolated point charged point particle produces an electric field with magnitude E at a point 2 m away from the charge. A point at which the field magnitude is E/4 is:

Accepted Answer

A)  1 m away from the charge 
B)  0.5 m away from the charge 
C)  2 m away from the charge 
D)  4 m away from the charge 
E)  8 m away from the charge 
A)  1 m away from the charge 
B)  0.5 m away from the charge 
C)  2 m away from the charge 
D)  4 m away from the charge 
E)  8 m away from the charge

Question 6

Electric field lines:

Accepted Answer

A)  are trajectories of a test charge 
B)  are vectors in the direction of the electric field 
C)  form closed loops 
D)  cross each other in the region between two point charges 
E)  are none of the above 
A)  are trajectories of a test charge 
B)  are vectors in the direction of the electric field 
C)  form closed loops 
D)  cross each other in the region between two point charges 
E)  are none of the above

Question 7

An electric dipole consists of a particle with a charge of +6 * 10-6 C at the origin and a particle with a charge of -6*10-6 C on the x axis at x = 3 *10-3 m. Its dipole moment is:

Accepted Answer

A)  1.8 * 10-8 C .m, in the positive x direction 
B)  1.8 * 10-8 C. m, in the negative x direction 
C)  0, because the net charge is 0 
D)  1.8 * 10-8 C . m, in the possitive y dirrection 
E)  1.8 *10-8 C . m, in the negative y dirrection 
A)  1.8 * 10-8 C .m, in the positive x direction 
B)  1.8 * 10-8 C. m, in the negative x direction 
C)  0, because the net charge is 0 
D)  1.8 * 10-8 C . m, in the possitive y dirrection 
E)  1.8 *10-8 C . m, in the negative y dirrection

Question 8

An electron traveling north enters a region where the electric field is uniform and points north. The electron:

Accepted Answer

A)  speeds up 
B)  slows down 
C)  veers east 
D)  veers west 
E)  continues with the same speed in the same direction 
A)  speeds up 
B)  slows down 
C)  veers east 
D)  veers west 
E)  continues with the same speed in the same direction

Question 9

A charged oil drop with a mass of 2 *10-4 kg is held suspended by a downward electric field of 300 N/C. The charge on the drop is:

Accepted Answer

A)  +1.5 *10-6 C 
B)  -1.5 * 10-6 C 
C)  +6.5 * 10-6 C 
D)  -6.5 * 10-6 C 
E)  0 
A)  +1.5 *10-6 C 
B)  -1.5 * 10-6 C 
C)  +6.5 * 10-6 C 
D)  -6.5 * 10-6 C 
E)  0

Question 10

The diagram shows a particle with positive charge Q and a particle with negative -Q. The electric field at point P on the perpendicular bisector of the line joining them is:

Accepted Answer

A)  $\uparrow$ 
B)  $\downarrow$ 
C)  $\rightarrow$ 
D)  $\leftarrow$ 
E)  zero 
A)  $\uparrow$ 
B)  $\downarrow$ 
C)  $\rightarrow$ 
D)  $\leftarrow$ 
E)  zero

Question 11

The purpose of Milliken's oil drop experiment was to determine:

Accepted Answer

A)  the mass of an electron 
B)  the charge of an electron 
C)  the ratio of charge to mass for an electron 
D)  the sign of the charge on an electron 
E)  viscosity 
A)  the mass of an electron 
B)  the charge of an electron 
C)  the ratio of charge to mass for an electron 
D)  the sign of the charge on an electron 
E)  viscosity

Question 12

A certain physics textbook shows a region of space in which two electric field lines cross each other. We conclude that:

Accepted Answer

A)  at least two point charges are present 
B)  an electrical conductor is present 
C)  an insulator is present 
D)  the field points in two directions at the same place 
E)  the author made a mistake 
A)  at least two point charges are present 
B)  an electrical conductor is present 
C)  an insulator is present 
D)  the field points in two directions at the same place 
E)  the author made a mistake

Question 13

An isolated charged point particle produces an electric field with magnitude E at a point 2 m away. At a point 1 m from the particle the magnitude of the field is:

Accepted Answer

A)  E 
B)  2E 
C)  4E 
D)  E/2 
E)  E/4 
A)  E 
B)  2E 
C)  4E 
D)  E/2 
E)  E/4

Question 14

The diagram shows the electric field lines in a region of space containing two small charged spheres (Y and Z). Then:

Accepted Answer

A)  Y is negative and Z is positive 
B)  the magnitude of the electric field is the same everywhere 
C)  the electric field is strongest midway between Y and Z 
D)  the electric field is not zero anywhere (except infinitely far from the spheres) 
E)  Y and Z must have the same sign 
A)  Y is negative and Z is positive 
B)  the magnitude of the electric field is the same everywhere 
C)  the electric field is strongest midway between Y and Z 
D)  the electric field is not zero anywhere (except infinitely far from the spheres) 
E)  Y and Z must have the same sign

Question 15

A cylinder has a radius of 2.1 cm and a length of 8.8 cm. Total charge 6.1 *10-7 C is distributed uniformly throughout. The volume charge density is:

Accepted Answer

A)  5.3 * 10-5 C/m3 
B)  5.3 *10-5 C/m2 
C)  8.5 *10-4 C/m3 
D)  5.0 * 10-3 C/m3 
E)  6.3* 10-2 C/m3 
A)  5.3 * 10-5 C/m3 
B)  5.3 *10-5 C/m2 
C)  8.5 *10-4 C/m3 
D)  5.0 * 10-3 C/m3 
E)  6.3* 10-2 C/m3

Question 16

A spherical shell has an inner radius of 3.7 cm and an outer radius of 4.5 cm. If charge is distributed uniformly throughout the shell with a volume density of 6.1*10-4 C/m3 the total charge is:

Accepted Answer

A)  1.0 * 10-7 C 
B)  1.3 * 10-7 C 
C)  2.0 *10-7 C 
D)  2.3*10-7 C 
E)  4.0 * 10-7 C 
A)  1.0 * 10-7 C 
B)  1.3 * 10-7 C 
C)  2.0 *10-7 C 
D)  2.3*10-7 C 
E)  4.0 * 10-7 C

Question 17

The units of the electric field are:

Accepted Answer

A)  J/(C.m) 
B)  J/C 
C)  J.C 
D)  J/m 
E)  none of these 
A)  J/(C.m) 
B)  J/C 
C)  J.C 
D)  J/m 
E)  none of these

Question 18

Positive charge +Q is uniformly distributed on the upper half of a semicircular rod and negative charge -Q is uniformly distributed on the lower half. What is the direction of the electric field at point P, the center of the semicircle?

Accepted Answer

A)  $\uparrow$ 
B)  $\downarrow$ 
C)  $\leftarrow$ 
D)  $\rightarrow$ 
E)    
A)  $\uparrow$ 
B)  $\downarrow$ 
C)  $\leftarrow$ 
D)  $\rightarrow$ 
E)

Question 19

The electric field at a distance of 10 cm from an isolated point particle with a charge of 2 *10-9 C is:

Accepted Answer

A)  1.8 N/C 
B)  180 N/C 
C)  18 N/C 
D)  1800 N/C 
E)  none of these 
A)  1.8 N/C 
B)  180 N/C 
C)  18 N/C 
D)  1800 N/C 
E)  none of these

Question 20

A total charge of 6.3 *10-8 C is distributed uniformly throughout a 2.7-cm radius sphere. The volume charge density is:

Accepted Answer

A)  3.7 * 10-7 C/m3 
B)  6.9 * 10-6 C/m3 
C)  6.9 *10-6 C/m2 
D)  2.5 * 10-4 C/m3 
E)  7.6 * 10-4 C/m3 
A)  3.7 * 10-7 C/m3 
B)  6.9 * 10-6 C/m3 
C)  6.9 *10-6 C/m2 
D)  2.5 * 10-4 C/m3 
E)  7.6 * 10-4 C/m3

Exam 22: Electric Fields

Experimenter A uses a test charge q0 and experimenter B uses a test charge 2q0 to measure an electric field produced by stationary charges. A finds a field that is:

The units of the electric field are:

The force exerted by a uniform electric field on a dipole is:

A charged particle is placed in an electric field that varies with location. No force is exerted on this charge:

An isolated point charged point particle produces an electric field with magnitude E at a point 2 m away from the charge. A point at which the field magnitude is E/4 is:

Electric field lines:

An electric dipole consists of a particle with a charge of +6 * 10-6 C at the origin and a particle with a charge of -6*10-6 C on the x axis at x = 3 *10-3 m. Its dipole moment is:

An electron traveling north enters a region where the electric field is uniform and points north. The electron:

A charged oil drop with a mass of 2 *10-4 kg is held suspended by a downward electric field of 300 N/C. The charge on the drop is:

The diagram shows a particle with positive charge Q and a particle with negative -Q. The electric field at point P on the perpendicular bisector of the line joining them is:

The purpose of Milliken's oil drop experiment was to determine:

A certain physics textbook shows a region of space in which two electric field lines cross each other. We conclude that:

An isolated charged point particle produces an electric field with magnitude E at a point 2 m away. At a point 1 m from the particle the magnitude of the field is:

The diagram shows the electric field lines in a region of space containing two small charged spheres (Y and Z). Then:

A cylinder has a radius of 2.1 cm and a length of 8.8 cm. Total charge 6.1 *10-7 C is distributed uniformly throughout. The volume charge density is:

A spherical shell has an inner radius of 3.7 cm and an outer radius of 4.5 cm. If charge is distributed uniformly throughout the shell with a volume density of 6.1*10-4 C/m3 the total charge is:

The units of the electric field are:

Positive charge +Q is uniformly distributed on the upper half of a semicircular rod and negative charge -Q is uniformly distributed on the lower half. What is the direction of the electric field at point P, the center of the semicircle?

The electric field at a distance of 10 cm from an isolated point particle with a charge of 2 *10-9 C is:

A total charge of 6.3 *10-8 C is distributed uniformly throughout a 2.7-cm radius sphere. The volume charge density is:

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Experimenter A uses a test charge q₀ and experimenter B uses a test charge 2q₀ to measure an electric field produced by stationary charges. A finds a field that is:

An electric dipole consists of a particle with a charge of +6 * 10^-⁶ C at the origin and a particle with a charge of -610^-⁶ C on the x axis at x = 3 10^-³ m. Its dipole moment is:

A charged oil drop with a mass of 2 *10^-⁴ kg is held suspended by a downward electric field of 300 N/C. The charge on the drop is:

A cylinder has a radius of 2.1 cm and a length of 8.8 cm. Total charge 6.1 *10^-⁷ C is distributed uniformly throughout. The volume charge density is:

A spherical shell has an inner radius of 3.7 cm and an outer radius of 4.5 cm. If charge is distributed uniformly throughout the shell with a volume density of 6.1*10^-⁴ C/m³ the total charge is:

The electric field at a distance of 10 cm from an isolated point particle with a charge of 2 *10^-⁹ C is:

A total charge of 6.3 *10^-⁸ C is distributed uniformly throughout a 2.7-cm radius sphere. The volume charge density is: