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electromagnetic theory, please solve carefully

3. The cones 0=21° and 0 = 159° are conducting surfaces and carry total
currents of 40 A, as shown in Figure 8.17. The currents return on a spherical
conducting surface of 0.25 m radius. (a) Find H in the region 0 <r< 0.25,
21 <0 159⁰, 0 < p < 2π. (b) How much energy is stored in this region?

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