Horizontal component of an electric field at origin

AI Thread Summary
The discussion focuses on calculating the horizontal component of an electric field at the origin of a semi-circle. The user attempts to apply the formula k∏(Q)/r but receives feedback indicating a misunderstanding of the formula's application, particularly regarding the nature of the charge distribution. There is confusion about the variable 'r', which is incorrectly equated to the length of the semi-circle rather than the appropriate distance for the electric field calculation. Participants suggest that the user may need to reconsider the formula used, as it seems more suited for point charges rather than a continuous charge distribution. Clarification on these points is essential for accurately solving the problem.
kirax105strike
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Homework Statement


Calculating the horizontal component of an electric field at the origin of a semi circle. The image link is: http://imgur.com/SXYs4Rp

The Attempt at a Solution



I've tried using the formula k∏(Q)/r (8.98755*10^9)∏(-7.85*10^-6) / .113 = -1.961 * 10^6.
Can anyone see what I am doing wrong?
 
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Where does your formula come from? It looks like a wrong application of the formula for a point-charge. Certainly your charge is not a point.
How did you get r? This is not the same as the length of the semi-circle.
 
The formula was from an example in the book where they used the length of the curve as r but I am guessing I have the wrong formula.
 

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