This preview shows page 1. Sign up to view the full content.
85. (a) Since
G
E
points down and we need an upward electric force (to cancel the
downward pull of gravity), then we require the charge of the sphere to be negative. The
magnitude of the charge is found by working with the absolute value of Eq. 2228:
4.4N
 
0.029C
150 N C
Fm
g
q
EE
==
=
=
,
or
0.029 C.
q
=−
(b) The feasibility of this experiment may be studied by using Eq. 223 (using
k
for
1/4
This is the end of the preview. Sign up
to
access the rest of the document.
 Fall '10
 Rebello,NobelS
 Charge, Force, Gravity, Work

Click to edit the document details