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Finding the electric field magnitude, and angle below the horizontal
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May8-09, 05:20 PM
1. The problem statement, all variables and given/known data
In the figure below d = 2.6 cm. What is the electric field at the position indicated by the dot in the figure?
2. Relevant equations
E = charge/4*pi*epsilon_0*distance^2
The figure is on the attachment.
3. The attempt at a solution
I decided to first find only the magnitude from each of the fields on the point.
charge 1 = 10 nC;
charge 2 = 5 nC;
charge 3 = -5nC
*I put all of the charges into Coulomb before any calculations
E1 = Kc1/5d^2;
E2 = Kc2/d^2;
E3 = kc3/4d^2;
After adding all of the Es together I get the wrong answer (as far as magnitude).
Answer is: 7.9 × 104 N/C, at 5.2° below the horizontal
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