Transcript Document

HRW
Chapter 24
24.4.2. The drawing shows three point charges of equal magnitude, but one
is positive (shown in blue) and two are negative (shown in yellow).
Some of the equipotential lines surrounding these charges are shown and
five are labeled using letters A, B, C, D, and E. At which of the labeled
points will an electron have the greatest electric potential energy?
a) A
b) B
c) C
d) D
e) E
24.4.3. The drawing shows three point charges of equal magnitude, but one is positive (shown in blue) and two are
negative (shown in yellow). Some of the equipotential lines surrounding these charges are shown and five are
labeled using letters A, B, C, D, and E. What is the direction of the electric field at the location of the letter “D?”
a) perpendicular to the
equipotential line marked
“D” and directed toward the
negative charge closest to it
b) parallel to the
equipotential line marked
“D” and directed toward the
location of the letter “C”
c) perpendicular to the
equipotential line marked
“D” and directed toward the
location of the letter “A”
d) toward the negative
charge in the lower part
of the drawing
e) toward the positive charge
Two conducting spheres, one having twice the diameter of the
other, are separated by a distance large compared to their
diameters. The smaller sphere (1) has charge q and the larger
sphere (2) is uncharged. If the spheres are connected by a long
thin wire:
4.
A)
1 and 2 have the same potential
B)
2 has twice the potential of 1
C)
2 has half the potential of 1
D)
1 and 2 have the same charge
E)
all of the charge is dissipated
24.4.5. Consider the equipotential
lines shown in the box. The labeled
cases indicate electric field line
drawings. Which of these cases best
matches the equipotential lines
shown?
a) 1
b) 2
c) 3
d) 4
e) None of these cases match the
equipotential lines shown.
24.8.1. An electric dipole is situated on the y axis as shown. The two
charges of opposite sign are of equal magnitude Q = 2.0 C.
Determine the magnitude of the electric potential at point P.
a) 1.1 × 109 V
b) 2.2 × 109 V
c) 4.5 × 109 V
d) 9.0 × 109 V
e) zero volts
24.7.1. Consider the four arrangements of three point charges. Rank the values of the
total electric potential at point P in each case in descending order (with the largest
first).
a) VA > VD > VC > VB
b) VC > VB > VD > VA
c) VC > VD > VA > VB
d) VB > VC > VB > VA
e) VD > VB > VA > VC
Two particle with charges Q and -Q are fixed at the vertices of an
equilateral triangle with sides of length a. If k = 1/4pe0, the work
required to move a particle with a charge q from the other vertex
to the center of the line joining the fixed charges is:
7.
A)
0
B)
kQq/a
C)
kQq/a2
D)
2kQq/a
E)
2kQq a
Three possible configurations for an electron e and a proton p are shown
below. Take the zero of potential to be at infinity and rank the three
configurations according to the potential at S, from most negative to most
positive.
1.
A)
1, 2, 3
B)
3, 2, 1
C)
2, 3, 1
D)
1 and 2 tie, then 3
E)
1 and 3 tie, then 2
Points R and T are each a distance d from each of two particles
with charges of equal magnitudes and opposite signs as shown.
If k = 1/4pe0, the work required to move a particle with negative
charge q from R to T is:
2.
A)
zero
B)
kqQ/d2
C)
kqQ/d
kqQ
2d
D)
E)

kQq/(2d)

Points R and T are each a distance d from each of two equal
positive charges as shown. If k = 1/4pe0, the work required to
move a particle with a charge q from R to T is:
A)
0
B)
kQq/d2
C)
kQq/d
D)
kqQ
E)
kQq/(2d)

2d

24.8.1. The drawing shows four points surrounding an electric dipole.
Which one of the following expressions best ranks the electric
potential at these four locations?
a) 1 > 2 > 3 > 4
b) 1 > 2 = 4 > 3
c) 3 > 2 > 4 > 1
d) 3 > 2 = 4 > 1
e) 2 = 4 > 1 = 3
Two conducting spheres, one having twice the diameter of the
other, are separated by a distance large compared to their
diameters. The smaller sphere (1) has charge q and the larger
sphere (2) is uncharged. If the spheres are connected by a long
thin wire:
4.
A)
1 and 2 have the same potential
B)
2 has twice the potential of 1
C)
2 has half the potential of 1
D)
1 and 2 have the same charge
E)
all of the charge is dissipated
5. Two conducting spheres are far apart. The smaller sphere
carries a total charge of Q. The larger sphere has a radius that is
twice that of the smaller and is neutral. After the two spheres
are connected by a conducting wire, the charges on the smaller
and larger spheres, respectively, are:
A Q/2 and Q/2
)
B
)
C
)
D
)
E
)
Q/3 and 2Q/3
2Q/3 and Q/3
zero and Q
2Q and –Q
24.11.1. Consider the system shown in the drawing. A positive charge Q is placed at
the center of a hollow conductor that was initially electrically neutral. The
arrows are pointing to four locations: (1) a point in the conductor near the outer
surface, (2) a point in the hollow space located halfway between the charge Q
and the inner surface, (3) a point in the conductor halfway between the inner and
outer surfaces, and (4) a point in the conductor near the inner surface. Which of
the following choices best ranks the electric potentials at these four locations?
a) 1 = 2 = 3 = 4
b) 2 > 1 = 3 = 4
c) 1 = 3 = 4 > 2
d) 1 > 4 > 3 > 2
e) 2 > 3 > 4 > 1