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(a) Verify that the Kuzmin potential Phi _(K)(R,z)=-(GM)/(sqrt(R^(2)+(a+|z|)^(2))) has grad^(2)Phi =0 for z!=0 , and so represents a surface density distribution Sigma (R) in
(a) Verify that the Kuzmin potential\
\\\\Phi _(K)(R,z)=-(GM)/(\\\\sqrt(R^(2)+(a+|z|)^(2)))
\ has
grad^(2)\\\\Phi =0
for
z!=0
, and so represents a surface density distribution
\\\\Sigma (R)
in the plane\
z=0
.\ (b) Use Gauss's law to determine
\\\\Sigma (R)
.\ (c) What is the circular orbit speed for a particle moving in the plane of the disk?
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