Physics 07 - General Physics 2 » Fall 2020 » Quiz 1 (A)

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Question #1
In a uniform electric field a proton has
A.   a constant velocity in the direction of the field.
B.   an approximately constant acceleration in a direction at right angles to the field.
C.   an approximately constant acceleration in a direction opposite to that of the field.
D.   a constant velocity in a direction opposite to that of the field.
E.   an approximately constant acceleration in the direction of the field.
Question #2
Two point charges of unknown magnitude and sign are a distance d apart. If the electric field strength is zero at a point between them on the line joining them, you can conclude that
A.   the charges are equal in magnitude and have the same sign.
B.   the charges are not necessarily equal in magnitude but have the same sign.
C.   the charges are not necessarily equal in magnitude but have opposite signs.
D.   there is not enough information to say anything specific about the charges.
E.   the charges are equal in magnitude but opposite in sign.
Question #3
Experimental evidence indicates that
A.   charge is quantized but not conserved.
B.   charge is quantized and conserved.
C.   charge is conserved but not quantized.
D.   None of these answers is correct.
E.   charge is neither quantized nor conserved.
Question #4
Electric charges of the same sign
A.   repel each other.
B.   exert no forces on each other.
C.   attract each other.
D.   also have the same magnitude.
E.   None of these is correct.
Question #5
Two small spheres repel one another electrostatically. Which of the following statements must be true?
A.   They are oppositely charged.
B.   Both are charged.
C.   Neither is charged.
D.   Both have the same charge.
E.   At least one sphere is charged.
Question #6
Which of the following statements about electric field lines are true?
A.   All of these statements are true.
B.   The lines are drawn symmetrically entering or leaving an isolated charge.
C.   The number of lines leaving a positive charge or entering a negative charge is proportional to the charge.
D.   Electric field lines begin on positive charges (or at infinity) and end on negative charges (or at infinity).
E.   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.
Question #7
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.   2000 times greater than
B.   equal to
C.   2000 times less than
D.   None of these answers is correct.
E.   negligible compared to
Question #8
A positive charge that is in an electric field experiences a force that is
A.   in the direction opposite to E.
B.   zero because the speed is zero.
C.   perpendicular to E.
D.   in the same direction as E.
E.   None of these is correct.
Question #9
The electric field at the surface of a conductor
A.   depends only on the total charge on the conductor.
B.   is parallel to the surface.
C.   depends only on the area of the conductor.
D.   depends on the area and curvature of the conductor and on its charge.
E.   depends only on the curvature of the surface.
Question #10
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 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 direction of each line indicates the direction that a positively charged particle would move if placed at that point in the electric field.
E.   The lines begin on positive charges and end on negative charges.
Question #11
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.   0.373 mN.
B.   1.25 mN.
C.   3.11 mN.
D.   1.02 μN.
E.   1.13 mN.
Question #12
Coulomb's law and Newton's law of gravitation both involve which of the following?
A.   the charge on the particle
B.   permittivity
C.   permeability
D.   the mass of the particle
E.   the inverse-square law
Question #13
Two charges of the same magnitude and sign are placed a certain distance apart. There is only one point in space near them where the electric field is zero. Which, if any, of the following statements about that point is true?
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 and between the charges.
E.   It must be on the line joining the charges but not between the charges.
Question #14
A uniformly positively charged spherical conductor is placed midway between two identical uncharged conducting spheres. How would the charges in the middle sphere be distributed?
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.
Question #15
Protons
A.   have 2000 times the charge of electrons.
B.   are about 2000 times less massive than electrons.
C.   are about 2000 times more massive than electrons.
D.   can have any amount of charge.
E.   have 1/2000 the charge of electrons.
Question #16
  
A.   4.5 × 107 N to the right
B.   1.1 × 106 N to the right
C.   1.1 × 106 N to the left
D.   2.5 × 106 N to the right
E.   2.5 × 106 N to the left
Question #17
A cube of side 3.56 cm has a charge of 9.11 μC placed at its center. Calculate the electric flux through one side of the cube.
A.   8.13 × 108 N·m2/C
B.   1.72 × 105 N·m2/C
C.   1.03 × 106 N·m2/C
D.   2.58 × 105 N·m2/C
E.   1.35 × 108 N·m2/C

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