Question 1

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

Question 2

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 3

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 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 F*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 F*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

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

Question 6

Choose the correct statement concerning electric field lines:

Accepted Answer

A)  field lines may cross 
B)  field lines are close together where the field is large 
C)  field lines point away from negatively charged particle 
D)  a point charge particle released from rest moves along a field line 
E)  none of these are correct 
A)  field lines may cross 
B)  field lines are close together where the field is large 
C)  field lines point away from negatively charged particle 
D)  a point charge particle released from rest moves along a field line 
E)  none of these are correct

Question 7

When the dipole moment of a dipole in a uniform electric field rotates to become more nearly aligned with the field:

Accepted Answer

A)  the field does positive work and the potential energy increases 
B)  the field does positive work and the potential energy decreases 
C)  the field does negative work and the potential energy increases 
D)  the field does negative work and the potential energy decreases 
E)  the field does no work 
A)  the field does positive work and the potential energy increases 
B)  the field does positive work and the potential energy decreases 
C)  the field does negative work and the potential energy increases 
D)  the field does negative work and the potential energy decreases 
E)  the field does no work

Question 8

The equation E = kq/r2 applies to:

Accepted Answer

A)  only pointlike particles 
B)  any symmetric objects 
C)  all objects 
D)  any spherical object 
E)  it applies to all objects as long as they are not moving 
A)  only pointlike particles 
B)  any symmetric objects 
C)  all objects 
D)  any spherical object 
E)  it applies to all objects as long as they are not moving

Question 9

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

Question 10

The diagram shows two identical particles, each with positive charge 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

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)  0.5 m away from the charge 
B)  1 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)  0.5 m away from the charge 
B)  1 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 12

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 13

Charge is placed on the surface of a 2.7-cm radius isolated conducting sphere. The surface charge density is uniform and has the value 6.9* 10-6 C/m2. The total charge on the sphere is:

Accepted Answer

A)  5.7 * 10-10 C 
B)  1.6 * 10-8 C 
C)  3.2 *10-8 C 
D)  6.3 * 10-8 C 
E)  7.5 * 10-4 C 
A)  5.7 * 10-10 C 
B)  1.6 * 10-8 C 
C)  3.2 *10-8 C 
D)  6.3 * 10-8 C 
E)  7.5 * 10-4 C

Question 14

Two charged point particles are located at two vertices of an equilateral triangle and the electric field is zero at the third vertex. We conclude:

Accepted Answer

A)  the two particles have charges with opposite signs and the same magnitude 
B)  the two particles have charges with opposite signs and different magnitudes 
C)  the two particles have identical charges 
D)  the two particles have charges with the same sign but different magnitudes 
E)  at least one other charged particle is present 
A)  the two particles have charges with opposite signs and the same magnitude 
B)  the two particles have charges with opposite signs and different magnitudes 
C)  the two particles have identical charges 
D)  the two particles have charges with the same sign but different magnitudes 
E)  at least one other charged particle is present

Question 15

Two point particles, one with charge +8 *10-9 C and the other with charge-2 * 10-9 C, are separated by 4 m. The electric field midway between them is:

Accepted Answer

A)  9 * 109 N/C 
B)  13,500 N/C 
C)  135,000 N/C 
D)  36 *10-9 N/C 
E)  22.5 N/C 
A)  9 * 109 N/C 
B)  13,500 N/C 
C)  135,000 N/C 
D)  36 *10-9 N/C 
E)  22.5 N/C

Exam 22: Electric Fields

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

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

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

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

The units of the electric field are:

Choose the correct statement concerning electric field lines:

When the dipole moment of a dipole in a uniform electric field rotates to become more nearly aligned with the field:

The equation E = kq/r2 applies to:

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:

The diagram shows two identical particles, each with positive charge Q. The electric field at point P on the perpendicular bisector of the line joining them is:

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:

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:

Charge is placed on the surface of a 2.7-cm radius isolated conducting sphere. The surface charge density is uniform and has the value 6.9* 10-6 C/m2. The total charge on the sphere is:

Two charged point particles are located at two vertices of an equilateral triangle and the electric field is zero at the third vertex. We conclude:

Two point particles, one with charge +8 *10-9 C and the other with charge-2 * 10-9 C, are separated by 4 m. The electric field midway between them is:

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

The equation E = kq/r² applies to:

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:

Charge is placed on the surface of a 2.7-cm radius isolated conducting sphere. The surface charge density is uniform and has the value 6.9* 10^-6 C/m². The total charge on the sphere is:

Two point particles, one with charge +8 10^-9 C and the other with charge-2 10^-9 C, are separated by 4 m. The electric field midway between them is: