Question 1

Positive charge Q is uniformly distributed on a semicircular rod. 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 2

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 3

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 4

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

Accepted Answer

A)  has zero charge 
B)  has charge of magnitude 1 C 
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)  has charge of magnitude 1 C 
C)  has charge of magnitude 1.6 *10-19 C 
D)  must be an electron 
E)  none of the above

Question 5

Two point charges are arranged as shown. In which region could a third charge +1 C be placed so that the net electrostatic force on it is zero?

Accepted Answer

A)  I only 
B)  I and II only 
C)  III only 
D)  I and III only 
E)  II only 
A)  I only 
B)  I and II only 
C)  III only 
D)  I and III only 
E)  II only

Question 6

The electric field due to a uniform distribution of charge on a spherical shell is zero:

Accepted Answer

A)  everywhere 
B)  nowhere 
C)  only at the center of the shell 
D)  only inside the shell 
E)  only outside the shell 
A)  everywhere 
B)  nowhere 
C)  only at the center of the shell 
D)  only inside the shell 
E)  only outside the shell

Question 7

Let k denote 1/4 $\pi$$\varepsilon$0. The magnitude of the electric field at a distance r from an isolated point charge q is:

Accepted Answer

A)  kq/r 
B)  kr/q 
C)  kq/r3 
D)  kq/r2 
E)  kq2/r2 
A)  kq/r 
B)  kr/q 
C)  kq/r3 
D)  kq/r2 
E)  kq2/r2

Question 8

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

Question 9

A 200-N/C electric field is in the positive x direction. The force on an electron in this field is:

Accepted Answer

A)  200 N in the positive x direction 
B)  200 N in the negative x direction 
C)  3.2 *10-17 m/s2, in the positive x direction 
D)  3.2 * 10-17 m/s2, in the negative x direction 
E)  0 
A)  200 N in the positive x direction 
B)  200 N in the negative x direction 
C)  3.2 *10-17 m/s2, in the positive x direction 
D)  3.2 * 10-17 m/s2, in the negative x direction 
E)  0

Exam 22: Electric Fields

Positive charge Q is uniformly distributed on a semicircular rod. What is the direction of the electric field at point P, the center of the semicircle?

Choose the correct statement concerning electric field lines:

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:

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

Two point charges are arranged as shown. In which region could a third charge +1 C be placed so that the net electrostatic force on it is zero?

The electric field due to a uniform distribution of charge on a spherical shell is zero:

Let k denote 1/4 π\piπε\varepsilonε 0. The magnitude of the electric field at a distance r from an isolated point charge q 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:

A 200-N/C electric field is in the positive x direction. The force on an electron in this field is:

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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:

Let k denote 1/4 $\pi$ $\varepsilon$ ₀. The magnitude of the electric field at a distance r from an isolated point charge q is: