Consider a coaxial cable formed by two concentric cylindrical conductors with the radius of the inner conductor being “a” and the outer conductor being “b”. Let L be the length of the cable. Assume the surface charge distribution on the inner conductor be defined by ρs. Determine the flux density D at a point ρ located radially between a and b, i.e. a < ρ < b.
---------------- 1
from gauss law,
Change Q at point P located is
------------ 2
from equation 1 and 2
(a<P<b)
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