Question 1

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

Question 2

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 3

As used in the definition of electric field, a "test charge":

Accepted Answer

A) has zero charge 
B) must be a proton 
C) has charge of magnitude 1.6 *10-19 C 
D) must be an electron 
E) none of the above 
A) has zero charge 
B) must be a proton 
C) has charge of magnitude 1.6 *10-19 C 
D) must be an electron 
E) none of the above

Question 4

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 5

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) 7.4 * 10-11 C/m3  
B) 5.3 *10-5 C/m3 
C) 5.3 *10-5 C/m2 
D) 8.5 * 10-4 C/m3 
E) 5.0 *10-3 C/m3 
A) 7.4 * 10-11 C/m3  
B) 5.3 *10-5 C/m3 
C) 5.3 *10-5 C/m2 
D) 8.5 * 10-4 C/m3 
E) 5.0 *10-3 C/m3

Question 6

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 7

The diagrams below depict four different charge distributions.The charged particles are all the same distance from the origin.The electric field at the origin:

Accepted Answer

A) is least for situation 1 
B) is greatest for situation 3 
C) is zero for situation 4 
D) is downward for situation 1 
E) is downward for situation 3 
A) is least for situation 1 
B) is greatest for situation 3 
C) is zero for situation 4 
D) is downward for situation 1 
E) is downward for situation 3

Question 8

Comparing the field of a single point charge with the field of an electric dipole,

Accepted Answer

A) the field of the point charge decreases more rapidly with distance 
B) the field of the point charge decreases less rapidly with distance 
C) the field of the point charge decreases more rapidly with distance but only along the dipole axis 
D) the field of the point charge decreases less rapidly with distance but only perpendicular to the dipole axis 
E) the fields decrease equally rapidly with distance 
A) the field of the point charge decreases more rapidly with distance 
B) the field of the point charge decreases less rapidly with distance 
C) the field of the point charge decreases more rapidly with distance but only along the dipole axis 
D) the field of the point charge decreases less rapidly with distance but only perpendicular to the dipole axis 
E) the fields decrease equally rapidly with distance

Question 9

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 10

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

Accepted Answer

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

Question 11

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 12

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 filed is the same everywhere 
C) the electric field is strongest midway between Y and Z 
D) Y is positive and Z is negative 
E) Y and Z must have the same sign 
A) Y is negative and Z is positive 
B) the magnitude of the electric filed is the same everywhere 
C) the electric field is strongest midway between Y and Z 
D) Y is positive and Z is negative 
E) Y and Z must have the same sign

Question 13

The diagrams show four possible orientations of an electric dipole in a uniform electric field   Rank them according to the magnitude of the torque exerted on the dipole by the field, least to greatest.

Accepted Answer

A) 1, 2, 3, 4 
B) 4, 3, 2, 1 
C) 1, 2, 4, 3 
D) 3, then 2 and 4 tie, then 1 
E) 1, then 2 and 4 tie, then 3 
A) 1, 2, 3, 4 
B) 4, 3, 2, 1 
C) 1, 2, 4, 3 
D) 3, then 2 and 4 tie, then 1 
E) 1, then 2 and 4 tie, then 3

Question 14

Two point particles, with charges of q1 and q2, are placed a distance r apart.The electric field is zero at a point P between the particles on the line segment connecting them.We conclude that:

Accepted Answer

A) q1 and q2 must have the same magnitude and sign 
B) P must be midway between the particles 
C) q1 and q2 must have the same sign but may have different magnitudes 
D) q1 and q2 must have equal magnitudes and opposite signs 
E) q1 and q2 must have opposite signs and may have different magnitudes 
A) q1 and q2 must have the same magnitude and sign 
B) P must be midway between the particles 
C) q1 and q2 must have the same sign but may have different magnitudes 
D) q1 and q2 must have equal magnitudes and opposite signs 
E) q1 and q2 must have opposite signs and may have different magnitudes

Question 15

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

Exam 22: Electric Fields

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

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

As used in the definition of electric field, a "test charge":

The units of the electric field are:

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:

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 diagrams below depict four different charge distributions.The charged particles are all the same distance from the origin.The electric field at the origin:

Comparing the field of a single point charge with the field of an electric dipole,

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:

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

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

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

The diagrams show four possible orientations of an electric dipole in a uniform electric field Rank them according to the magnitude of the torque exerted on the dipole by the field, least to greatest.

Two point particles, with charges of q1 and q2, are placed a distance r apart.The electric field is zero at a point P between the particles on the line segment connecting them.We conclude that:

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

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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:

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:

Two point particles, with charges of q₁ and q₂, are placed a distance r apart.The electric field is zero at a point P between the particles on the line segment connecting them.We conclude that: