The two circular coils of radius a and separation b of Problem 5.7 can be described in
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The two circular coils of radius a and separation b of Problem 5.7 can be described in cylindrical coordinates by the current density
J = фIδ(ρ – a)[δ(z – b/2) + δ(z + b/2)]
(a) Using the formalism of Problem 5.8, calculate the internal and external multipole moments for L = 1,..., 5.
(b) Using the internal multipole expansion of Problem 5.8, write down explicitly an expression for Bz on the z axis and relate it to the answer of Problem 5.7b.
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a We can understand this using an argument about mirrors For the parallel components the image currents must be parallel and in the same direction for ...View the full answer
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