What do you expect to happen to the field as you get really far from the rod?
$$E_x = \dfrac{\lambda}{4\pi\varepsilon_0\}\dfrac{L}{x\sqrt{x^2+L^2}}$$
1. $E_x$ goes to 0.
2. $E_x$ begins to look like a point charge.
3. $E_x$ goes to $\infty$.
4. More than one of these is true.
5. I can't tell what should happen to $E_x$.
Note:
CORRECT ANSWER: D (A and B)
I spent ... hours on the second homework.
1. 1-2
2. 3-4
3. 5-6
4. 7-8
5. More than 9
I felt ... doing the Python part of the homework.
1. relatively comfortable
2. comfortable enough
3. kind of uncomfortable
4. really uncomfortable
5. I didn't do it
## Announcements
* Will start "counting" clickers next Monday
- Register your clicker!
* If you need help with Python, let me know ASAP!
* Honors Option
- Talk to me about your ideas
- Option 1: Design a computational activity for this class
- Option 2: Develop a computational model and paper for an interesting electrostatics phenomenon
- Option 3: Pitch me your idea
Taylor Series?
1. I remember those and am comfortable with them.
2. I rememeber them, but it might take a little while to get comfrtable.
3. I've definitely worked with them before, but I don't recall them.
4. I have never seen them.
Given the location of the little bit of charge ($dq$), what is $|\vec{\mathfrak{R}}|$?
<img src ="./images/sphereintegrate.png" align="left" style="width: 300px";/>
1. $\sqrt{z^2+r'^2}$
2. $\sqrt{z^2+r'^2-2zr'\cos\theta}$
3. $\sqrt{z^2+r'^2+2zr'\cos\theta}$
4. Something else
Note:
CORRECT ANSWER: B
Which of the following are vectors?
(I) Electric field, (II) Electric flux, and/or (III) Electric charge
1. I only
2. I and II only
3. I and III only
4. II and III only
5. I, II, and II
Note:
* CORRECT ANSWER: A
## Gauss' Law
<img src="./images/gauss_pt_charge.png" align="center" style="width: 350px";/>
$$\oint_S \mathbf{E}\cdot d\mathbf{A} = \int_V \dfrac{\rho}{\varepsilon_0}d\tau$$