4. Current density is given in cylindrical coordinates as J = -10ʻza, A/m? in the region 0s ps 20 um; for p 2 20 um. J= 0. a) Find the total current crossing the surface z = 0.1 min the a, direction. b) If the charge velocity is 2 10 m/s at z = 0.1m, find py c) If the volume charge density at z = 0.15 m is -2000 C/m', find the charge velocity there.
4. Current density is given in cylindrical coordinates as J = -10ʻza, A/m? in the region 0s ps 20 um; for p 2 20 um. J= 0. a) Find the total current crossing the surface z = 0.1 min the a, direction. b) If the charge velocity is 2 10 m/s at z = 0.1m, find py c) If the volume charge density at z = 0.15 m is -2000 C/m', find the charge velocity there.
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Transcribed Image Text:4. Current density is given in cylindrical coordinates as J= -10ʻzSa, A/m? in the region 0s
p< 20 μη: forp 2 20 μm . J-0.
a) Find the total current crossing the surface z = 0.1 min the az direction.
b) If the charge velocity is 2*10° m/s at z = 0.1m, find py
c) If the volume charge density at z = 0.15 m is -2000 C/m', find the charge velocity
there.
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