Physics 07 - General Physics 2 » Fall 2020 » Quiz 1

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Question #1
Electrons
A.   have 2000 times the charge of protons.
B.   are about 2000 times more massive than protons.
C.   have 1/2000 the charge of protons.
D.   can have any amount of charge.
E.   are about 2000 times less massive than protons.
Question #2
Experimental evidence indicates that
A.   None of these answers is correct.
B.   charge is conserved but not quantized.
C.   charge is neither quantized nor conserved.
D.   charge is quantized and conserved.
E.   charge is quantized but not conserved.
Question #3
The force between two very small charged bodies is found to be F. If the distance between them is doubled without altering their charges, the force between them becomes
A.   F/2.
B.   4F.
C.   1/F2.
D.   2F.
E.   F/4.
Question #4
A surface is so constructed that, at all points on the surface, the E vector points inward. Therefore, it can be said that
A.   A surface is so constructed that, at all points on the surface, the E vector points inward. Therefore, it can be said that
B.   the surface vector ΔS at all points on the surface is necessarily perpendicular to the electric field vector E.
C.   the surface encloses a net negative charge.
D.   the surface vector ΔS at all points on the surface is necessarily parallel to the electric field vector E.
E.   the surface encloses a net positive charge.
F.   the surface encloses no net charge.
Question #5
A proton is about 2000 times more massive than an electron but they both have charges of the same magnitude. The magnitude of the force on an electron by a proton is ____ the magnitude of the force on the proton by the electron.
A.   None of these answers is correct.
B.   equal to
C.   2000 times greater than
D.   2000 times less than
E.   negligible compared to
Question #6
Which of the following circumstances about Gauss's law is true?
A.   Gauss's law is applicable for two or more point charges.
B.   Gauss's law is applicable for a point charge.
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.
Question #7
If nonelectric forces are negligible, a positively charged particle released from rest in a nonuniform electric field
A.   accelerates in the direction of the field.
B.   moves perpendicular to the field with constant velocity.
C.   moves only along equipotential lines.
D.   moves with constant velocity parallel to the field.
E.   accelerates perpendicularly to the field.
Question #8
Protons
A.   are about 2000 times less massive than electrons.
B.   have 2000 times the charge of electrons.
C.   have 1/2000 the charge of electrons.
D.   can have any amount of charge.
E.   are about 2000 times more massive than electrons.
Question #9
Which of the following statements about electric field lines is NOT true?
A.   Electric field lines cross midway between charges that have equal magnitude and sign.
B.   The lines begin on positive charges and end on negative charges.
C.   The direction of each line indicates the direction that a positively charged particle would move if placed at that point in the electric field.
D.   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.
E.   The number of lines leaving a positive charge or entering a negative charge is proportional to the charge.
Question #10
A positive charge of 94.0 nC is 12.0 cm from a negative charge of 53.0 nC. The force on one of the charges due to the other is approximately
A.   1.02 μN.
B.   3.11 mN.
C.   0.373 mN.
D.   1.25 mN.
E.   1.13 mN.
Question #11
The SI units of electric fields can be expressed as
A.   C/m2.
B.   V·C.
C.   N.
D.   V/m.
E.   C/s.
Question #12
How many electrons must be transferred to a body to produce a charge of 125 nC?
A.   1.25 × 10–7
B.   7.81 × 1011
C.   1.60 × 10–19
D.   1.28 × 1012
E.   3.45 × 1011
Question #13
Charges q1 and q2 exert repulsive forces of 10 N on each other. What is the repulsive force when their separation is decreased so that their final separation is 80% of their initial separation?
A.   8.0 N
B.   12 N
C.   10 N
D.   16 N
E.   6.4 N
Question #14
An electron is released from rest in a uniform electric field. If the electric field is 1.25 kN/C, at the end of 20 ns the electron's velocity will be approximately
A.   3.0 × 108 m/s.
B.   2.5 × 10–5 m/s.
C.   2.5 × 103 m/s.
D.   4.4 × 106 m/s.
E.   3.9 × 103 m/s.
Question #15
An electric field is E = 400 N/C for x > 0 and E = –400 N/C for x < 0. A cylinder of length 30 cm and radius 10 cm has its center at the origin and its axis along the x-axis such that one end is at x = +15 cm and the other is at x = –15 cm. What is the flux through the curved surface of the cylinder?
A.   0.25 kN·m2/C
B.   1.3 kN·m2/C
C.   zero
D.   0.13 MN·m2/C
E.   1.3 N·m2/C

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