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--- 184_notes:examples:week3_superposition_three_points [2018/05/29 14:25] – curdemma
+++ 184_notes:examples:week3_superposition_three_points [2021/05/19 14:46] (current) – schram45
@@ Line 17: / Line 17: @@
 ===Representations===
 [{{ 184_notes:3_superposition.png?300 |Point Charge Distribution}}]
+<WRAP TIP>
+===Assumptions===
+  * Charge is constant: Simplifies the values of each charge meaning they are not charging or discharging over time.
+  * Charges are not moving: Simplifies the separation vectors of each charge as these would be changing if the charges were moving through space.
+</WRAP>
 ===Goal===
@@ Line 28: / Line 34: @@
 First, let's find the contribution from Charge 1. The separation vector  $\vec{r}_1$  points from the source to the observation ( $1\rightarrow P$ ), so  $\vec{r}_1 = 2R\hat{x}$ , and  $\hat{r_1}=\frac{\vec{r}_1}{|r_1|}=\frac{2R\hat{x}}{2R}=\hat{x}$
 Visually, this is what we know about  $\hat{r_1}$ , and what we expect for  $\vec{E}_1$ , since Charge 1 is negative:
-{{ 184_notes:3_superposition_1.png?400 |E-vector and r-hat for Charge 1}}
+[{{ 184_notes:3_superposition_1.png?400 |E-vector and r-hat for Charge 1}}]
 Now, we can find  $\vec{E}_1$  and  $V_1$ . Before we show the calculation, though, we need to make an assumption about the electric potential.
 <WRAP TIP>