A.   an approximately constant acceleration in the direction of the field.

B.   a constant velocity in a direction opposite to that of the field.

C.   a constant velocity in the direction of the field.

D.   an approximately constant acceleration in a direction at right angles to the field.

E.   an approximately constant acceleration in a direction opposite to that of the field.

A.   the charges are not necessarily equal in magnitude but have the same sign.

B.   there is not enough information to say anything specific about the charges.

C.   the charges are not necessarily equal in magnitude but have opposite signs.

D.   the charges are equal in magnitude and have the same sign.

E.   the charges are equal in magnitude but opposite in sign.

A.   charge is conserved but not quantized.

B.   None of these answers is correct.

C.   charge is quantized but not conserved.

D.   charge is neither quantized nor conserved.

E.   charge is quantized and conserved.

A.   None of these is correct.

B.   exert no forces on each other.

C.   attract each other.

D.   also have the same magnitude.

E.   repel each other.

A.   At least one sphere is charged.

B.   Both have the same charge.

C.   Neither is charged.

D.   They are oppositely charged.

E.   Both are charged.

A.   At large distances from a system of charges, the field lines are equally spaced and radial, as if they came from a single point charge equal to the net charge of the system.

B.   Electric field lines begin on positive charges (or at infinity) and end on negative charges (or at infinity).

C.   All of these statements are true.

D.   The number of lines leaving a positive charge or entering a negative charge is proportional to the charge.

E.   The lines are drawn symmetrically entering or leaving an isolated charge.

A.   2000 times less than

B.   2000 times greater than

C.   negligible compared to

D.   None of these answers is correct.

E.   equal to

A.   perpendicular to E.

B.   None of these is correct.

C.   in the direction opposite to E.

D.   in the same direction as E.

E.   zero because the speed is zero.

A.   is parallel to the surface.

B.   depends only on the curvature of the surface.

C.   depends only on the area of the conductor.

D.   depends only on the total charge on the conductor.

E.   depends on the area and curvature of the conductor and on its charge.

A.   The direction of each line indicates the direction that a positively charged particle would move if placed at that point in the electric field.

B.   The density of the lines (the number per unit area perpendicular to the lines) is proportional to the magnitude of the field at that point.

C.   The lines begin on positive charges and end on negative charges.

D.   The number of lines leaving a positive charge or entering a negative charge is proportional to the charge.

E.   Electric field lines cross midway between charges that have equal magnitude and sign.

A.   3.11 mN.

B.   1.02 μN.

C.   1.13 mN.

D.   0.373 mN.

E.   1.25 mN.

A.   the inverse-square law

B.   the charge on the particle

C.   permittivity

D.   the mass of the particle

E.   permeability

A.   It cannot be on the line joining the charges.

B.   Its position depends on the size of the charges.

C.   It must be on the line joining the charges and between the charges.

D.   None of these is correct.

E.   It must be on the line joining the charges but not between the charges.

A.   There are more positive charges near the sides of the sphere that are next to the other two spheres compared to the other regions of the sphere.

B.   None of these is correct.

C.   The positive charges stay uniformly distributed on the surface of the middle sphere.

D.   There are more positive charges near the front and back of the sphere compared to the sides next to the two other spheres.

E.   There are more positive charges near the top and bottom of the sphere compared to the sides next to the two other spheres.

A.   can have any amount of charge.

B.   have 2000 times the charge of electrons.

C.   have 1/2000 the charge of electrons.

D.   are about 2000 times more massive than electrons.

E.   are about 2000 times less massive than electrons.

A.   2.5 × 106 N to the right

B.   1.1 × 106 N to the left

C.   2.5 × 106 N to the left

D.   4.5 × 107 N to the right

E.   1.1 × 106 N to the right

A.   1.03 × 106 N·m2/C

B.   2.58 × 105 N·m2/C

C.   1.35 × 108 N·m2/C

D.   1.72 × 105 N·m2/C

E.   8.13 × 108 N·m2/C