Finding mass only given electrons

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    Electrons Mass
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Homework Help Overview

The problem involves calculating the increase in mass of a neutral balloon after it picks up 42 electrons through static electricity. The subject area pertains to electrostatics and mass-energy equivalence.

Discussion Character

  • Exploratory, Conceptual clarification

Approaches and Questions Raised

  • The original poster attempts to apply equations related to electric fields and forces but expresses uncertainty about the necessary parameters, such as the electric field and distance. Some participants question the complexity of the approach and suggest focusing on the mass of the electrons directly.

Discussion Status

The discussion includes attempts to clarify the problem and explore different approaches. Some participants provide guidance by suggesting simpler methods to find the mass of the electrons, while the original poster indicates a moment of realization about the solution.

Contextual Notes

There is a mention of perceived insufficient information regarding the electric field and distance, which may affect the original poster's approach to the problem.

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Homework Statement


A neutral balloon picks up 42 electrons when it is rubbed on someone's head.
Calculate how much the mass of the balloon has increased.


Homework Equations



E=F/q
F=kq1q2/r^2

The Attempt at a Solution


Well, I do know the answer is 3.82 x 10^-29.
Using E=F/q q=1.6x10^-19 but I don't know where the electric field comes from.
Using F=kq1q2/r^2 both q's= 1.6x10^-19 and k=9x10^9 but I don't know where the distance comes from.
I feel like I haven't been given enough information...? Please help.
 
Physics news on Phys.org
What's the mass of an electron? (Look it up!)
 
I think you are over-complicating this. How much do 42 electrons weigh?
 
Yeah, never mind I just got it
 

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