Review

Electrostatics
An electrically neutral object can be
attracted by a positively charged object
because
A. like charges repel each other
B. the net charge in a closed system
varies
C. the neutral body becomes charged
by contact
D. the charges on a neutral body can be
redistributed
In the charging of a solid, charge
transfer is accomplished by the
displacement of
A. both electrons and protons
B. protons, only
C. neither electrons nor protons
D. electrons, only
A positively charged object was
used to give an electroscope a
negative charge. The electroscope
was charged by
A. induction
B. conduction
C. contact
D. reduction
Coulombs
1 C = 6.241E18
The distance between an electron and a proton is varied.
Which pair of graphs best represents the relationship
between gravitational force, Fg, and distance, r, and the
relationship between electrostatic force, Fe, and
distance, r, for these particles?
A.
B.
C.
D.
Two metal spheres having charges of
+4.0E–6 coulomb and +2.0E–5 coulomb,
respectively, are brought into contact and
then separated. After separation, the charge
on each sphere is
A. 2.1E–6 C
B. 8.0E–6 C
C. 1.2E–5 C
D. 8.0E–11 C
A particle could have a
charge of
A. 0.8E–19 C
B. 1.2E–19 C
C. 3.2E–19 C
D. 4.1E–19 C
Coulomb’s Law
F = ke q1q2
d2
What is the magnitude of the
electrostatic force between two
electrons separated by a distance of
1.00E– 8 meter?
A. 2.30E–12 N
B. 2.30E–20 N
C. 1.44E–1 N
D. 2.56E–22 N
A point charge of +3.0E-7 coulomb is
placed 2.0E-2 meter from a second
point charge of +4.0E-7 coulomb. The
magnitude of the electrostatic force
between the charges is
A. 2.7 N
B. 5.4E-2 N
C. 3.0E-10 N
D. 6.0E-12 N
Voltage
V = Work/q
e-1 charge = -1.6023073E-19
The energy required to move
one elementary charge through a
potential difference of 5.0 volts is
A. 8.0 J
B. 8.0E–19 J
C. 1.6E–19 J
D. 5.0 J
Moving 2.5E–6 coulombs of charge
from point A to point B in an electric
field requires 6.3E–4 joules of work.
The potential difference between points
A and B is approximately
A. 1.6E–9 V
B. 4.0E–3 V
C. 2.5E2 V
D. 1.0E14 V
Electric Field
Which diagram best represents the electric field near a
positively charged conducting sphere?
A.
C.
B.
D.
Which diagram best illustrates the electric field around
two unlike charges?
A.
B.
C.
D.
An electron is located in an electric
field of magnitude 600 Newtons per
Coulomb. What is the magnitude of
the electrostatic force acting on the
electron?
A. 9.60E–17 N
B. 3.75E21 N
C. 2.67E–22 N
D. 6.00E2 N
An electrostatic force of 20 Newtons is
exerted on a charge of 8.0E-2 Coulomb
at point P in an electric field. The
magnitude of the electric field intensity
at P is
A. 1.6 N/C
B. 20. N/C
C. 4.0E–3 N/C
D. 2.5E2 N/C
Extra
A negatively charged plastic comb is
brought close to, but does not touch, a
small piece of paper. If the comb and
the paper are attracted to each other,
the charge on the paper
A. may be positive or neutral
B. must be negative
C. must be positive
D. may be negative or neutral
Negatively charged rod A is used
to charge rod B by induction.
Object C is then charged by
direct contact with rod B. The
charge on object C is
A. neutral
B. positive
C. negative
An electric force F exists between two
charged spheres. If the quantity of
charge on each sphere is doubled, the
electric-force between the two spheres
will be equal to
A. F/2
B. 2F
C. 3F
D 4F
An object possessing an excess of
6.0E+6 electrons has a net charge of
magnitude
A. 5.5E–24 C
B. 9.6E–13 C
C. 2.7E–26 C
D. 3.8E–13 C
If an object has a net negative charge of 4.0
coulombs, the object possesses
A. 6.3 10+18 more electrons than protons
B. 6.3 10+18 more protons than electrons
C. 2.5 10+19 more electrons than protons
D. 2.5 10+19 more protons than electrons
Two electrons are separated by a
distance of 3.00E–6 meter. What are
the magnitude and direction of the
electrostatic forces each exerts on the
other?
A. 2.56E–17 N away from each other
B. 7.67E–23 N away from each other
C. 2.56E–17 N toward each other
D. 7.67E–23 N toward each other
The diagram below shows two metal spheres
charged to +1.0E-6 coulomb and +3.0E-6
coulomb, respectively, on insulating stands
separated by a distance of 0.10 meter. The
spheres are touched together and then returned
to their original positions. As a result, the
magnitude of the electrostatic force between the
spheres changes from 2.7 N to
A. 14 N
B. 1.4 N
C. 3.6 N
D. 1.8 N
The diagram represents an electron within
an electric field between two parallel plates
that are charged with a potential difference
of 40.0 volts. If the magnitude of the
electric force on the electron is 2.00 ×10–15
Newton, the magnitude of the electric field
strength between the charged plates is
A. 3.20E–34 N/C
B. 2.00E–14 N/C
C. 1.25E4 N/C
D. 2.00E+16 N/C