Suspending Charged Particles using Electric Fields, homework help

label Physics
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Jan 18th, 2016

Thank you for the opportunity to help you with your question!

Part A:

Charge on particle must be negative as then it will experience force in upward direction balancing the mg force due to its weight. 
Therefore, mg=qE ( q is charge on particle, only magnitude, and E is electric field) 

0.0146*9.81=q(660)

q=0.000201303C.

Part B:

The magnitude of an electric field in which the electric force on a proton is equal in magnitude to its weight = E 

qE =mg 

E =mg/q 

E =1.67*10^-27*9.8/1.60*10^-19 

E =1.0228756*10^-7 N/C 

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jan 18th, 2016

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