Quiz 1

A  1.3 kN·m2/C

B  1.3 N·m2/C

C  0.13 MN·m2/C

D  0.25 kN·m2/C

E  zero

A  4.4 × 106 m/s.

B  2.5 × 10–5 m/s.

C  3.0 × 108 m/s.

D  3.9 × 103 m/s.

E  2.5 × 103 m/s.

A  12 N

B  8.0 N

C  10 N

D  16 N

E  6.4 N

A  3.45 × 1011

B  1.28 × 1012

C  1.25 × 10–7

D  7.81 × 1011

E  1.60 × 10–19

A  C/m2.

B  V/m.

C  C/s.

D  V·C.

E  N.

A  1.13 mN.

B  1.25 mN.

C  3.11 mN.

D  1.02 μN.

E  0.373 mN.

A  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.

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

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

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

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  can have any amount of charge.

B  are about 2000 times more massive than electrons.

C  have 2000 times the charge of electrons.

D  have 1/2000 the charge of electrons.

E  are about 2000 times less massive than electrons.

A  accelerates perpendicularly to the field.

B  moves only along equipotential lines.

C  accelerates in the direction of the field.

D  moves perpendicular to the field with constant velocity.

E  moves with constant velocity parallel to the field.

A  Gauss’s law is applicable for a point charge.

B  Gauss’s law is applicable for two or more point charges.

C  Gauss’s law is applicable for any objects of any shape.

D  Gauss’s law is applicable in highly symmetric cases such as uniformly charged infinite plane, infinite cylinder, or sphere.

E  All of the above.

A  negligible compared to

B  None of these answers is correct.

C  2000 times less than

D  equal to

E  2000 times greater than

A  the surface encloses no net charge.

B  the surface vector ΔS at all points on the surface is necessarily perpendicular to the electric field vector E.

C  the surface vector ΔS at all points on the surface is necessarily parallel to the electric field vector E.

D  A surface is so constructed that, at all points on the surface, the E vector points inward. Therefore, it can be said that

E  the surface encloses a net positive charge.

F  the surface encloses a net negative charge.

A  F/4.

B  F/2.

C  4F.

D  2F.

E  1/F2.

A  None of these answers is correct.

B  charge is quantized but not conserved.

C  charge is quantized and conserved.

D  charge is neither quantized nor conserved.

E  charge is conserved but not quantized.

A  are about 2000 times more massive than protons.

B  are about 2000 times less massive than protons.

C  have 2000 times the charge of protons.

D  can have any amount of charge.

E  have 1/2000 the charge of protons.