Question 1

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 2

A uniform electric field of 300 N/C makes an angle of 25 $\degree$ with the dipole moment of an electric dipole.If the torque exerted by the field has a magnitude of 2.5 *10-7 N.m, the dipole moment must be:

Accepted Answer

A) 8.3* 10-10 C.m 
B) 9.2 *10-10 C.m 
C) 2.0 * 10-9 C.m 
D) 8.3 * 10-5 C.m 
E) 1.8 *10-4 C.m 
A) 8.3* 10-10 C.m 
B) 9.2 *10-10 C.m 
C) 2.0 * 10-9 C.m 
D) 8.3 * 10-5 C.m 
E) 1.8 *10-4 C.m

Question 3

Two thin spherical shells, one with radius R and the other with radius 2R, surround an isolated charge point particle.The ratio of the number of field lines through the larger sphere to the number through the smaller is:

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 1/2 
E) 1/4 
A) 1 
B) 2 
C) 4 
D) 1/2 
E) 1/4

Question 4

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 5

The magnitude of the force of a 400-N/C electric field on a 0.02-C point charge is:

Accepted Answer

A) 8 N 
B) 5 * 10-5 N 
C) 8 * 10-3 N 
D) 0.08 N 
E) 2 * 103 N 
A) 8 N 
B) 5 * 10-5 N 
C) 8 * 10-3 N 
D) 0.08 N 
E) 2 * 103 N

Question 6

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 7

An electric field is most directly related to:

Accepted Answer

A) the momentum of a test charge 
B) the kinetic energy of a test charge 
C) the potential energy of a test charge 
D) the force acting on a test charge 
E) the charge carried by a test charge 
A) the momentum of a test charge 
B) the kinetic energy of a test charge 
C) the potential energy of a test charge 
D) the force acting on a test charge 
E) the charge carried by a test charge

Question 8

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 9

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 10

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.The direction of the electric field due to the dipole at points on the x axis is:

Accepted Answer

A) in the positive x direction 
B) in the negative x direction 
C) in the positive y direction 
D) in the negative y direction 
E) in the positive x direction between the charges and in the negative x direction elsewhere 
A) in the positive x direction 
B) in the negative x direction 
C) in the positive y direction 
D) in the negative y direction 
E) in the positive x direction between the charges and in the negative x direction elsewhere

Question 11

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 12

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

Exam 22: Electric Fields

The equation E = kq/r2 applies to:

A uniform electric field of 300 N/C makes an angle of 25 °\degree° with the dipole moment of an electric dipole.If the torque exerted by the field has a magnitude of 2.5 *10-7 N.m, the dipole moment must be:

Two thin spherical shells, one with radius R and the other with radius 2R, surround an isolated charge point particle.The ratio of the number of field lines through the larger sphere to the number through the smaller is:

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 magnitude of the force of a 400-N/C electric field on a 0.02-C point 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:

An electric field is most directly related to:

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:

The force exerted by a uniform electric field on a dipole 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 -6* 10-6 C on the x axis at x = 3 * 10-3 m.The direction of the electric field due to the dipole at points on the x axis is:

The units of the electric field are:

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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The equation E = kq/r² applies to:

A uniform electric field of 300 N/C makes an angle of 25 $\degree$ with the dipole moment of an electric dipole.If the torque exerted by the field has a magnitude of 2.5 *10^-7 N.m, the dipole moment must be:

The electric field at a distance of 10 cm from an isolated point particle with a charge of 2* 10^-9 C 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 -6* 10^-6 C on the x axis at x = 3 * 10^-3 m.The direction of the electric field due to the dipole at points on the x axis is: