<img src="./images/capacitor_gap_connected.png" align="center" style="width: 500px";/> A parallel plate capacitor is attached to a battery which maintains a constant voltage difference V between the capacitor plates. While the battery is attached, the plates are pulled apart. The electrostatic energy stored in the capacitor 1. increases. 2. decreases. 3. stays constant. Note: * CORRECT ANSWER: B * Potential same; field is reduced; but shows up squared while d is increased, overall goes down
I feel that Exam 1 was a fair assessment. 1. Strongly Agree 2. Agree 3. Neither Agree/Disagree 4. Disagree 5. Strongly Disagree
I feel that Exam 1 was aligned with what we have been doing (in class and on homework). 1. Strongly Agree 2. Agree 3. Neither Agree/Disagree 4. Disagree 5. Strongly Disagree
### Laplace's Equation <img src="./images/laplace.png" align="center" style="width: 900px";/>
<img src="./images/region_w_no_charge.png" align="right" style="width: 200px";/> A region of space contains no charges. What can I say about \$V\$ in the interior? 1. Not much, there are lots of possibilities for \$V(r)\$ in there 2. \$V(r)=0\$ everywhere in the interior. 3. \$V(r)=\$constant everywhere in the interior Note: * CORRECT ANSWER: A
<img src="./images/region_with_no_charge_Vset.png" align="right" style="width: 200px";/> A region of space contains no charges. The boundary has V=0 everywhere. What can I say about \$V\$ in the interior? 1. Not much, there are lots of possibilities for \$V(r)\$ in there 2. \$V(r)=0\$ everywhere in the interior. 3. \$V(r)=\$constant everywhere in the interior Note: * CORRECT ANSWER: B
<img src="./images/cubical_lattice.png" align="center" style="width: 300px";/> If you put a positive test charge at the center of this cube of charges, could it be in stable equilibrium? 1. Yes 2. No 3. ??? Note: * CORRECT ANSWER: B