Problem 2: A 5.0-mm-diameter proton beam carries a total current of I = 1.5 mA. The current density in the proton beam, which increases with distance from the center, is given by J = Jedge (r/R), where R is the radius of the beam and Jedge is the current density at the edge. Determine the value of Jedge. a) Fig. 3 shows the cross section of the beam. Compute the current dI flowing through the ring of radius r and width dr shown in the figure. Notice that for small dr the area of the ring can be approximated by the area of a rectangle that you can get by "unrolling" the ring.

Problem 2: A 5.0-mm-diameter proton beam carries a total current of I = 1.5 mA. The current density in the proton beam, which increases with distance from the center, is given by J = Jedge (r/R), where R is the radius of the beam and Jedge is the current density at the edge. Determine the value of Jedge. a) Fig. 3 shows the cross section of the beam. Compute the current dI flowing through the ring of radius r and width dr shown in the figure. Notice that for small dr the area of the ring can be approximated by the area of a rectangle that you can get by "unrolling" the ring.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter16: Electromagnetic Waves

Section: Chapter Questions

Problem 78P: The prefix “mega” (M) and “kilo” (k), when referring to amounts of computer data, refer to factors...

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