Quiz 1 (A)

A  1.72 × 105 N·m2/C

B  2.58 × 105 N·m2/C

C  1.35 × 108 N·m2/C

D  8.13 × 108 N·m2/C

E  1.03 × 106 N·m2/C

A  4.5 × 107 N to the right

B  2.5 × 106 N to the left

C  1.1 × 106 N to the right

D  1.1 × 106 N to the left

E  2.5 × 106 N to the right

A  have 1/2000 the charge of electrons.

B  have 2000 times the charge of electrons.

C  can have any amount of charge.

D  are about 2000 times more massive than electrons.

E  are about 2000 times less massive than electrons.

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

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

C  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.

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  None of these is correct.

A  None of these is correct.

B  Its position depends on the size of the charges.

C  It cannot be on the line joining the charges.

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

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

A  the inverse-square law

B  permeability

C  permittivity

D  the mass of the particle

E  the charge on the particle

A  1.02 μN.

B  1.25 mN.

C  3.11 mN.

D  1.13 mN.

E  0.373 mN.

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

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

C  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.

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

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

A  depends only on the curvature of the surface.

B  is parallel to the surface.

C  depends only on the total charge on the conductor.

D  depends only on the area of the conductor.

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

A  perpendicular to E.

B  in the direction opposite to E.

C  zero because the speed is zero.

D  None of these is correct.

E  in the same direction as E.

A  negligible compared to

B  equal to

C  2000 times less than

D  None of these answers is correct.

E  2000 times greater than

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

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

D  All of these statements are true.

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

A  At least one sphere is charged.

B  They are oppositely charged.

C  Both are charged.

D  Neither is charged.

E  Both have the same charge.

A  attract each other.

B  also have the same magnitude.

C  exert no forces on each other.

D  repel each other.

E  None of these is correct.

A  charge is conserved but not quantized.

B  charge is quantized and conserved.

C  charge is neither quantized nor conserved.

D  None of these answers is correct.

E  charge is quantized but not conserved.

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

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

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

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

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

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

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