Electric field: What is the charge on the sphere
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Electric field: What is the charge on the sphere

[From: ] [author: ] [Date: 11-10-18] [Hit: ]
If the electric field between the plates is 6.25x10^4 N/C downwards, what is the charge on the sphere?Hey guys! Im struggling on my Physics and would appreciate any help. Thanks so much for your time!......
A plastic sphere of mass 3.00x10^-15 kg is suspended between two horizontally oriented, charged plates. If the electric field between the plates is 6.25x10^4 N/C downwards, what is the charge on the sphere?

Hey guys! I'm struggling on my Physics and would appreciate any help. Thanks so much for your time! :)

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The question is not very clear, so I could be wrong about this, but I assume that the sphere is initially charged and the sphere is floating between the two plates because the electric force on the sphere cancels (exactly) the gravitational force. So, assuming I interpreted the question correctly, here's what you have to do:

Gravitational force on sphere is:
F = mg = (3.00*10^-15) * 9.8 = 2.94 * 10^-14 N

Electric force on sphere is:
F = q*E

So if we want to solve for the charge q, we get
q = F/E = 2.94 * 10^-14 N / (6.25x10^4 N/C)
= 4.704 * 10^-19 C
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