Unformatted text preview: 4. Serway & Jewett Problem 30 : 31 . An in²nitely long, cylindrical conductor of radius R carries a current I as shown in Figure P 30 : 31 . The current-density magnitude J , however, is not uniform over any cross-section of the conductor, but rather is a function J = Cr , where C is a positive constant and r is the perpendicular distance from the cylinder±s axis. (a) Find an expression for the magnetic-²eld magnitude at any distance r < R . (b) Find an expression for the magnetic-²eld magnitude at any distance r > R . 5. A thin, conducting, in²nite plate, carrying a uniform charge density ± , initially lies at rest in the xy plane. The plate is set into motion with a constant speed v in the + x direction. Find the magnetic ²eld outside the plate. Suggestion: Symmetry dictates that the magnetic ²eld magnitude be constant. 1...
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- Spring '09
- Magnetic Field, Electric charge, Fusion power, Tokamak, Jewett Problem, magnetic-…eld magnitude