Download Chattahoochee Technical College PHYS 1110

Chattahoochee Technical College
PHYS 1110
Chapter #22
Conceptual Physics
Spring 2013
Quiz #18
Name:__________________________________
Due: 9:00 a.m. on Tuesday, March 26, 2013
1) An electron is pushed into an electric field from a point with potential 0 V to a point with potential
-3 V. The electrons electric potential energy increases by
A) 0.0 J.
B) 6.4 × 10-19 J.
C) 4.8 × 10-19 J.
1)
D) 3.2 × 10-19 J.
E) 1.6 × 10-19 J .
2) Two charges separated by one meter exert 1-N forces on each other. If the charges are pushed to 1/3
meter separation, the force on each charge will be
A) 2 N.
B) 16 N.
C) 4 N.
D) 9 N.
E) 1 N.
2)
3) Which of the following forces binds atoms together to form molecules?
A) electrical
B) centripetal
C) gravitational
D) nuclear
E) none of these
3)
4) A negative ion has more
A) electrons than protons.
B) protons than neutrons.
C) neutrons than protons.
D) electrons than neutrons.
E) protons than electrons.
4)
5) Coulomb's law is an inverse square law.
A) None of the above
C) False
5)
B) Maybe
D) True
6) In an electrically neutral atom the number of electrons surrounding the nucleus is equal to the
number of
A) protons in the nucleus.
B) neutrons in the nucleus.
C) Choices A and B are both correct.
D) Choices A and B are both incorrect.
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6)
7) Particle A has four times the charge of nearby particle B. Compared to the force on Particle A, the
force on Particle B is
A) half as much.
B) twice as much.
C) the same.
D) four times as much.
E) None of the above choices are correct.
7)
8) When the distance between two charges is tripled, the electrical force between the charges
A) halves.
B) is reduced by 1/4.
C) is reduced by 1/9.
D) is reduced by 1/3.
E) None of the above choices are correct.
8)
9) A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?
A) electron
B) proton
C) Both accelerate equally.
D) Neither accelerates.
9)
10) The net charge on a charged capacitor is
A) a function of the distance between the capacitor plates.
B) dependent on the area of the capacitor plates.
C) zero.
D) dependent on the size of the electric field between the plates.
10)
11) A conductor differs from an insulator in that a conductor
A) has faster moving molecules.
B) has more energy than an insulator.
C) has more electrons than protons.
D) has more protons than electrons.
E) none of these
11)
12) An electroscope is charged positively as shown by foil leaves that stand apart. As a positive charge
is brought close to the electroscope, the leaves
A) fall closer together.
B) spread apart further.
C) do not move.
12)
13) Charge carriers in a metal are electrons rather than protons because electrons are
A) smaller.
B) loosely bound.
C) negative.
D) all of these
E) none of these
13)
14) When a single charge q is placed on one corner of a square, the electric field at the center of the
square is F/q. If three other charges with the same magnitude and sign of the original charge are
placed on the other corners, the electric field at the center of the square due to these four equal
charges is
A) F/q.
B) F/(2q).
C) 4F/q.
D) F/(4q).
E) 0
14)
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15) To say that an object is electrically polarized is to say
A) its charges have been rearranged.
B) it is electrically charged.
C) it is only partially conducting.
D) it is to some degree magnetic.
E) its internal electric field is zero.
15)
16) Calculate the magnitude of the force of interaction between point charges Q1 = 5.00 µC and Q2 =
16)
-3.00 µC. The point charges are 55.0 cm apart.
A) 4.46 × 1011 N
B) 4.46 × 107 N
C) .446 N
D) -.446 N
17) The direction of an electric field is the direction of the force that the field would exert on
A) an atom.
B) a molecule.
C) a small negative test charge.
D) a small positive test charge.
E) a neutral test charge.
17)
18) To say that electric charge is quantized means that the magnitude of the charge on an object
A) can be neither created nor destroyed.
B) is sometimes positive.
C) may occur in an infinite variety of quantities.
D) is a whole-number multiple of the magnitude of the charge of one electron.
E) will interact with neighboring electric charges.
18)
19) The electrical force on a 2-C charge is 120 N. What is the value of the electric field at the place
where the charge is located?
A) 60 N/C
B) 240 N/C
C) 20 N/C
D) 30 N/C
E) 120 N/C
19)
20) The electric field around an isolated electron has a certain strength 1 cm from the electron. The
electric field strength 2 cm from the electron is
A) twice as much.
B) half as much.
C) one-fourth as much.
D) four times as much.
E) None of the above choices are correct.
20)
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