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Define up as the +z direction. The mass of an electron is 9.11×10−319.11×10-31 kg. The mass...

Define up as the +z direction. The mass of an electron is 9.11×10−319.11×10-31 kg. The mass of a proton is 1.67×10−271.67×10-27 kg.

What is the electric field z-component (Ez) needed to balance a proton against gravity?  

What is the electric field z-component (Ez) needed to balance an electron against gravity?

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