1. Solution of Problem 1. 20 point

2. W E definition : 4 point Gauss’s law : 3 point Relationship between D and E : 3 point

3. V definition : 2 point Get V : 2 point Get W : 2 point Solution 1 : 10 point Answer : 4 point

4. Get W : 6 point Answer : 4 point Solution 2 : 10 point

5. Solution of Problem 2. 20 point

6. Declare formula : 10 point r = za z = 0.04, r’ = pa p Calculate : 6 point Answer : 4 point 2.48 V

7. Solution of Problem 3.a 10 point

8. Declare definition : 2 point Calculate voltage affect to charges : 2 point Declare formula : 2 point Calculate total energy using symmetric property : 2 point Answer : 2 point

9. Solution of Problem 3.b 10 point

10. Calculate total energy : 4 point Calculate total energy using superposition principle : 4 point Answer : 2 point