Find the Electric field strength at a point between two charges

  • Thread starter rocapp
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  • #1
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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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  • #2
SammyS
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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 ?
 
  • #3
95
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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?
 
  • #4
95
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That is correct. I fixed the problems. Thanks!
 

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