1. two identical metal balls are
suspended by insulating
threads. both balls have the
same net charge. in this
problem, do not assume the
balls are point charges.
ball 1
ball 2
free-body diagram
for ball 1
free-body diagram
for ball 2
a. draw a separate free-body
diagram for each ball. label the forces to
indicate:
• the object exerting the force,
• the object on which the force is exerted,
• the type of force (gravitational, normal,
and
. whether the force is a contact or a non-
contact force.
b. suppose the charge on the second ball is reduced slightly, so that it is less than that on the
first ball.
predict whether the angle
that ball 1 makes with the
vertical will be greater
than, less than, or equal to
the angle that ball 2 makes
with the vertical. explain.
sketch your answer at right.
ball 1
ball 2
how does the free-body diagram for each ball in this case compare to the corresponding free
body diagram that you drew in part a? if the magnitudes or directions of any of the forces ar
different, describe how they differ.
c. predict what will happen if
the net charge on ball 2 is
reduced to zero. make a
sketch to illustrate your
answer.
ball 1
ball 2