p45_002.pdf

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Chapter 45 - 45.2
2. We establish a ratio, using Eq. 22-4 and Eq. 14-1:
F gravity
F electric
=
ke 2 /r 2 = 4 πε 0 Gm e
e 2
=
(6 . 67
×
10 − 11 N
·
m 2 / C 2 )(9 . 11
×
10 − 31 kg) 2
(9 . 0
×
10 9 N
·
m 2 / C 2 )(1 . 60
×
10 − 19 C) 2
=2 . 4
×
10 − 43 .
Since F gravity
F electric , we can neglect the gravitational force acting between particles in a bubble
Gm e /r 2
chamber.
 

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