63. A lightweight aluminum sphere (m = 15.1 g) hangs by an insulating thread in a uniform electric field
of 585 N/C directed upward as shown in Figure 6.
The tension in the sphere is 0.167 N. (7.3) CA
+ + + + +
Figure 6
(a) Sketch all the forces acting on the sphere.
(b) Determine the magnitude and direction of the
electric force acting on the sphere.
(c) Calculate the magnitude and sign of the charge
on the sphere.