Differences

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--- 184_notes:examples:week10_current_ring [2021/07/07 17:38] – schram45
+++ 184_notes:examples:week10_current_ring [2021/07/07 17:42] – schram45
@@ Line 31: / Line 31: @@
 <WRAP TIP>
 ===Assumption===
-We assumed the current was flowing counterclockwise when the loop was viewed from the top. This means our current flows in the same direction as phi. If we had assumed a clockwise current flow then this value would just need a negative in front of it.
+We assumed the current was flowing counterclockwise when the loop was viewed from the top. This means our current flows in the same direction as $\phi$. If we had assumed a clockwise current flow then this value would just need a negative in front of it.
 </WRAP>
@@ Line 50: / Line 50: @@
         &= \frac{\mu_0 I}{2R} \hat{z}
 \end{align*}
+<WRAP TIP>
+===Assumption===
+Assuming the current is steady allows us to take the $I$ out of the above integral, if this were not the case we would have to find out how current varies in the direction of $\phi$ and leave it in the integral.
+</WRAP>
 We show the visual result below.
 {{ 184_notes:10_ring_with_b.png?300 |Ring of Current, With Magnetic Field at Center}}