3. There is a current distribution with the density of J₀ A/m² in the volume between the planes y=a and y=-a. What is the magnetic flux density in the region of -a＜y＜a due to the current distribution? (A)(B) (C)(D) None of the above

11. Consider a layer structure of the structure as the figure shown below. This structure has three perfect conductor metal layers, and two insulator layers. One of the insulator layer is composed of Material1, the other insulator layer is composed of Material2 and Material3. The dielectric constant and the dielectric strength of the materials are listed in the Table below. This structure is infinitely extended in y direction; L1＞＞3μm; L2 ＞＞ 3μm; and L1=L2. Applying a voltage Vin between the top perfect conductor and the bottom perfect conductor from 0 V to 20 V, which material will breakdown first? (A) Material1 (B) Material2 (C) Material3 (D) None of the above

3. There is a current distribution with the density of J₀ A/m² in the volume between the planes y=a and y=-a. What is the magnetic flux density in the region of -a＜y＜a due to the current distribution?
(A)
(B)
(C)
(D) None of the above

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