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How far apart the two electrons be, if the force between them equals the weight of an electron? What in case of protons?

How far apart the two electrons be, if the force between them equals the weight of an electron? What in case of protons?

Grade:12

2 Answers

Arun
25750 Points
5 years ago
Dear Abhijeet
 
k e^2 / r^2 = m g 
r = e [k / (m g)]^1/2 
then 
1) r = 1.6x10^-19 [9x10^9 / (9.1x10^-31*9.8)]^1/2 = 5.08 m [electrons] 
2) r = 1.6x10^-19 [9x10^9 / (1.67x10^-27*9.8)]^1/2 = 0.12 m [protons]
 
Regards
Arun (askIITians forum expert)
ankit singh
askIITians Faculty 614 Points
3 years ago
by force balance
ke2/r2=mg
thenput the values of charge fo protons and
r = 1.6x10^-19 [9x10^9 / (9.1x10^-31*9.8)]^1/2 = 5.08 m [electrons] 
2) r = 1.6x10^-19 [9x10^9 / (1.67x10^-27*9.8)]^1/2 = 0.12 m [protons]

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