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atn9200
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Homework Statement
Determine the magnitude of the electric field at a point midway between a -8.1μC and a 8.9μC charge 8.0cm apart. Assume no other charges are nearby.
Determine the direction.
(Answer in two sig figs.)
Homework Equations
E=k/r^2(Q1+Q2)
The Attempt at a Solution
I drew this: -8.1---------p----------8.9
This is what I think I'm supposed to do.
The field due to -8.1 charge points toward it.
The field due to 8.9 points away. So they are both pointing towards the negative charge?
so E=k/.08^2(8.1e-6+8.9e-6)=2.4e7 N/C but this is incorrect. Please explain why! Thanks.
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