Simple Parallel-Plate Capacitor Question please HeLP

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Homework Help Overview

The discussion revolves around a problem involving a parallel-plate capacitor, specifically focusing on calculating the charge on the electrodes given the electric field strength and dimensions of the plates.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the formula relating electric field strength, charge, and area, with one participant attempting to apply it but questioning their calculations. Others raise concerns about potential miscalculations and the relevance of constants used in the equations.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the problem and calculations. Some guidance has been offered regarding the calculations, but there is no explicit consensus on the correct approach or answer yet.

Contextual Notes

Participants are considering the implications of having two electrodes and whether this affects the charge calculation. There are also discussions about the constants used in the calculations, indicating potential confusion about their application.

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Simple Parallel-Plate Capacitor Question...please HeLP!

Homework Statement


A parallel-plate capacitor is formed from two 2.32 cm × 2.32 cm electrodes spaced 2.85 mm apart. The electric field strength inside the capacitor is 85600000 N/C. What is the charge (in nC) on each electrode?


Homework Equations





The Attempt at a Solution


E = Q / Eo * A
A = 0.0232 * 0.0232 = 5.38e^-4
Q = (E * Eo * A) 8 1,000,000,000 = 407.75 nC
What am I doing wrong?
 
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Do I divided 407.75 by 2? Since there are 2 electrodes? I don't know what else I could be doing wrong.
 
Thats not right either...does anyone know where I am going wrong?
 
you multiplied incorrectly, I guess. plugging into my calculator, I get 407.942041 nC

or, to the right number of sig figs 408 nC
 
How did you get that?
K = 9 x10^9
Eo = 8.85 x10^-12
A = .0232 *.0232
right?
 
K? That doesn't come in anywhere... I used E and A and epsilon_0. Just multiply them all together.
 
I know I put that to see if you were using the same number to get Eo...I am not getting the right answer though
 

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