ASSIGNMENT #4
DUE ON OCTOBER 6, 2005
HAND-IN
CHAPTER #22:
QUESTIONS:
6 In Figure 22-25,
two identical circular nonconducting rings are
centered on the same line. For three situations, the uniform charges on rings A
and B are, respectively, (1) q0 and q0,
(2) q0 and q0, and (3) q0
and q0. Rank the situations according to the magnitude of the
net electric
field at (a) point P1 midway between the rings,
(b) point P2 at the center of ring B, and (c) point P3
to the right of ring B, greatest first.
PROBLEMS:
24 In Figure 22-41a,
two curved plastic rods, one of charge +q and the other of charge q,
form a circle of radius R = 8.50 cm in an xy plane. The x axis passes through both of
the connecting points, and the charge is distributed uniformly on both rods. If
q = 15.0 pC, what are the (a) magnitude and
(b) direction (relative to the positive direction of the x axis) of the electric field
produced
at P, the center of the circle?
29 In Figure 22-45,
positive charge
q = 7.81 pC is spread uniformly along a thin nonconducting rod of length L = 14.5 cm. What are
the (a) magnitude and (b) direction (relative to the positive direction of the x
axis) of the electric field produced at point P, at
distance R = 6.00 cm from the rod along its perpendicular bisector?
55 In Figure 22-53, a
semi-infinite nonconducting rod (that is, infinite
in one direction only) has uniform linear charge
density
l. Show that the electric
field at
point P makes an angle of 45° with the rod and that this result is independent
of the distance R. (Hint: Separately find the component of
parallel
to the rod and the component perpendicular to the rod.)
59 A particle of charge Q lies at the origin of an xy coordinate system. A particle of charge q lies at coordinates (4.0a, 0). We are concerned about the electric field these particles produce at point P at coordinates (4.0a, 3.0a). What is Q/q if, at P, (a) the x and y components of the electric field are equal and (b) the electric field has no y component?
ONLINE
CHAPTER #22:
QUESTIONS:
PROBLEMS:
22 Figure 22-40
shows two parallel nonconducting rings with their
central axes along a common line. Ring 1 has uniform charge
q1 and radius R; ring 2 has uniform charge q2
and the same radius R. The rings are separated by distance d =
3.00R. The net electric field at point P on the common line,
at distance R from ring 1, is zero. What is the ratio q1/q2?
45 Two large parallel copper plates are 5.0 cm apart and have
a uniform electric field between them as depicted in Figure 22-48.
An electron is released from the negative plate at the same time that a proton
is released from the positive plate. Neglect the force of the particles on each
other and find their distance from the positive plate when they pass each
other. (Does it surprise you that you need not know the electric field to solve
this problem?)
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