1. Reference Solution of Midterm exam 120150210 정보석

2. declare definition: 3 point Calculation: 3 point Answer: 1 point 1. (a) 7 point

3. Gauss’s law: 3 point Calculation: 3 point Answer: 1 point Symmetric property 1. (b) 7 point

4. Answer of region1: 2 point Answer of region2: 2 point Answer of region3: 2 point 1. (c) 6 point

5. Force from y=-0.4 to y=+0.4 (Answer1) : 2 point Declare formula: 5 point Declare definition: 5 point Calculation: 6 point Force from y=+0.4 to y=-0.4 (Answer2) : 2 point 2. 20 point

6. Derivate Ep from definition : 2 point Declare definition: 2 point Solution without formula First substitution 3. (a) 10 point

7. Second substitution Unit of Ep : uV/m

8. Derivate Ez from definition : 2 point First substitution Second substitution

9. Answer: 2 point Calculation: 2 point

10. Answer 2 point Declare formula: 4 point Calculation: 4 point 3. (a) using formula

11. Answer 2 You have to derivate the equation below, unless you derivate it already(see 3a solution without formula). Without derivation process on answer sheets, there would be no point even the answer is correct. Derivate formula: 4 point (If already exists on 3a, omitting the process can be permitted.) 3. (b) Declare definition: 2 point

12. Calculate Ep : 1 point Calculate Ez : 1 point Answer : 2point

13. Property caused by infinitiy : 4 point Declare gauss’s law : 4 point Declare association between D and E in freespace : 4 point Calculation : 4 point 4. 20 point Electric flux density(Answer1) : 2 point

14. Electric field(Answer2): 2 point Gauss’s law : 2 point Relationship between D and E field: 2 point First conversion : 2 point 5. 20 point

15. Correspondence Cordinate variables: 2 point Cordinate components: 2 point Answer : 4 point Second conversion : 2 point Integration by substitution: 4 point