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--- 184_notes:examples:week9_earth_field [2021/07/01 15:29] – schram45
+++ 184_notes:examples:week9_earth_field [2021/07/05 21:55] (current) – [Solution] schram45
@@ Line 18: / Line 18: @@
 ===Approximations & Assumptions===
-  *  $q$ ,  $\vec{v}$ ,  $h$ , and  $\vec{B}_{\text{earth}}$  are all constants: All these variable could easily be changing in this problem. However, to simplify down the model to better analyze the situation we will assume all these things are constant. This could be an accurate assumption if the UFO were causing steadily over us at the given height.
+  *  $q$ ,  $\vec{v}$ ,  $h$ , and  $\vec{B}_{\text{earth}}$  are all constants: All these variable could easily be changing in this problem. However, to simplify down the model to better analyze the situation we will assume all these things are constant. This could be an accurate assumption if the UFO were cruising steadily over us at the given height.
   * Your sense of direction and eyesight can be trusted.
@@ Line 60: / Line 60: @@
  $q=\frac{4 \pi h^2 B_{\text{earth}} \tan \theta}{\mu_0 v} = 131 \text{ C}$
+This is a lot of charge. Since magnetic fields are very small in magnitude, and this can be seen in the magnetic constant, it makes sense that we would need such a large amount of charge to have a noticeable effect on our compass. Uf we were to compare the magnetic field of a moving charge to the electric field from that charge, the electric field would be much larger.