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Homework Statement
Two point charges are placed on the x axis. The first charge, q1= 8 nC, is placed a distance 16m from the origin along the positive x axis; the second charge, q2= 6 nC , is placed a distance 9m from the origin along the negative x axis.
Find the electric field at the origin, point O.
Give the x and y components of the electric field as an ordered pair. Express your answer in Newtons per coulomb to three significant figures. Keep in mind that an x component that points to the right is positive and a y component that points upward is positive.
Now, assume that charge q2 is negative; q2 = -6 nC. What is the net electric field at the origin, point O?
Give the x and y components of the electric field as an ordered pair. Express your answer in Newtons per coulomb to three significant figures. Keep in mind that an x component that points to the right is positive and a y component that points upward is positive.
Homework Equations
E = [tex]\frac{kQ}{r^2}[/tex]
The Attempt at a Solution
I start by "placing" a test charge at the origin.
Here's what I think I should do:
E = [tex]\frac{kQ_1}{r^2}[/tex] + [tex]\frac{kQ_2}{r^2}[/tex]
E_1 = [tex]\frac{(9x10^9)(8x10^-9)}{16^2}[/tex] = 0.261 N/C
E_2 = [tex]\frac{(9x10^9)(6x10^-9)}{9^2}[/tex] = 0.667 N/C
E = E_1 + E_2 = 0.261 + 0.667 = 0.928 N/C
Am I right?
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