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oddiseas
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Homework Statement
What current density would produce the vector potential
A(r)=(-kmu/2pi)In(r/a) (in the z direction)
where k is a constant, in cylindrical coordinates?
Homework Equations
The Attempt at a Solution
i have done this three times and i get zero current density.So i am wondering if i am making a mistake, there is only one component for A the z component so when i use B=grad*A, i get a field in the fita direction, then when i use J=(grad*B)/mu i get zero.