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Unit II Assessment

# Unit II Assessment - Homework#4 Chapters 5 and 6 1 Within...

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Homework #4, Chapters 5 and 6 1. Within the region 1 5 cm, 0 0.3 , 0 z 2 cm, current density is given as J = (200 cos ) a /( + 0.01)A/m 2 . What total current in the a direction crosses the surface: (a) = 0, 1 5 cm, 0 z 2 cm? (b) = 0.3 , 1 5 cm, and 0 z 2 cm? (c) Calculate  J at = 2 cm, = 0.15 , z = 1 cm. 2. A certain current density is given as J = [100 cos /( r 2 + 1)] a r A/m 2 . (a) How much current flows through the spherical cap, r = 3, 0 /6, 0 2 ? (b) What value would J av have if the same total current were produced by a uniform current density J av over the cap? (c) The same total current flows through the cap, r = 10, 0 , 0 2 . Find . 3. A conductor of circular cross section is constructed of steel (   6 x 10 6 / .m) in the region 0 1 mm, and copper ( = 5.8 x 10 7 / .m), 1 1.5 mm. The total current carried by the conductor is 100 A. Calculate: (a) J Cu ; (b) J st ; (c) E Cu ; (d) E
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