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Sample Responses
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Point charges are located at the points (-3, 0), (0, 0), and (3, 0). The outer two are positive, while the one at the origin is negative. To calculate the electric field at the point (0, 3), we need "r hat" vectors that point from each point charge towards the point of interest. Please find the three "r hat"'s.
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1. To find 'r hat''s, you need to know the equation. The 'r hat' is the
vector r divided by the magnitude of r. So the 'r hat' for every point is:
for the (-3,0) is '-i hat', for (0,0) is zero and for (3,0) is 'i hat'.
2. The first 'r hat' at point (-3,0) is 3i. The second 'r hat' at point (3,0) is -3i. The third 'r hat' at (0,0) is 0 since the vector r at that point is -3i + 3i= 0.
3. Well from what I can see in the book, the r(hat)'s must all be pointing
toward the field point which in this case is the point at (0,3). So one
would be going straight up the Y axis, another would be in a 45 degree angle
going toward the field point from the left, and the other would be towards
the field point from the right at a 45 degree angle.
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