Find the Electric field strength at a point between two charges

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Homework Help Overview

The discussion revolves around calculating the electric field strength at a point between two charges, with specific focus on parts C and D of the problem. Participants are addressing issues related to unit conversions and the application of relevant equations.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss their attempts to calculate electric field strengths, noting discrepancies in their results. There is a focus on the importance of using correct units and the implications of unit conversions on the calculations.

Discussion Status

Some participants have identified unit conversion as a potential source of error, leading to a productive exchange about the correct application of the permittivity constant. There is acknowledgment of previous mistakes, and one participant reports having resolved their issues.

Contextual Notes

Participants are working with measurements in millimeters and charges in nanoCoulombs, which may affect their calculations and the interpretation of constants used in the equations.

rocapp
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Homework Statement


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Homework Equations



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The Attempt at a Solution



I have tried parts C and D several times, and the homework program is telling me that it's still not correct. For C, I keep getting:

7.7x10^8 N/C

for D I keep getting:

7.1x10^-12 N/C

In order to find these, I know you just plug in the known values into the equation from part A. But each time I plug these in, I get an incorrect answer. Please help. Thanks in advance!
 

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rocapp said:

Homework Statement


See images


Homework Equations



See images

The Attempt at a Solution



I have tried parts C and D several times, and the homework program is telling me that it's still not correct. For C, I keep getting:

7.7x10^8 N/C

for D I keep getting:

7.1x10^-12 N/C

In order to find these, I know you just plug in the known values into the equation from part A. But each time I plug these in, I get an incorrect answer. Please help. Thanks in advance!
attachment.php?attachmentid=57199&d=1364444477.png


attachment.php?attachmentid=57200&d=1364444477.png


For parts C & D please show your work, i.e. show exactly what numbers you are putting into your formula.

You are using millimeters and nanoCoulombs, aren't you ?
 
Oh! Units were the problem. Does this change the value of the permittivity constant from 8.85x10^-12 F/m to 8.85x10^-9 F/mm?
 
That is correct. I fixed the problems. Thanks!
 

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