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demonhunter19
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Homework Statement
A thin circular sheet of glass of diameter 6 meters is rubbed with a cloth on one surface, and becomes charged uniformly. A chloride ion (a chlorine atom which has gained one extra electron) passes near the glass sheet. When the chloride ion is near the center of the sheet, at a location 0.5 mm from the sheet, it experiences an electric force of 8e-15 N, toward the glass sheet.
It will be useful to you to draw a diagram on paper, showing field vectors, force vectors, and charges, before answering the following questions about this situation.
Which of the following statements about this situation are correct? Select all that apply.
The charged disk is the source of the electric field that causes the force on the chloride ion.
The force on the chloride ion is equal to the electric field of the glass sheet.
The electric field that acts on the chloride ion is due to the charge on the glass sheet and to the charge on the chloride ion.
The electric field of the glass sheet is equal to the electric field of the chloride ion.
The net electric field at the location of the chloride ion is zero.
Homework Equations
Electric Field of a Disk:
Electric FORCE due to some charge: F=qE
The Attempt at a Solution
I'm not sure which statement is correct, but it seems like the first three (The charged disk is the source of the electric field that causes the force on the chloride ion. The force on the chloride ion is equal to the electric field of the glass sheet. The electric field that acts on the chloride ion is due to the charge on the glass sheet and to the charge on the chloride ion) are correct.
I know the electric force exerted on the Chlorine atom, which is 8e-15N, and I set it equal to (-1.6e-19)(Q/(6^2*pi))/2*ε), which is really the relative equation between the electric force and the electric field, F=qE, q being the charge.
The answer I got for Q (the charge of the disk, which is what the 2nd part of the question is asking) is -.000025C. I'm not sure if it's right, but given the relative size of the disk, it makes sense.
And I'm still not certain about which statements above are correct (1st part of question)
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