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Select the surface by looking for the line in the line that runs perpendicular to the spool face. . Click on the plane below the line by using the plane selector. Then input a Current of .01 amps and 280 for the Number of Conductors. Click on the arrow below to parameterize the Operating Current.       

Then click on Generate Conduction Paths, this will show the solver interpretation of the coil. If the solver’s interpretation of the coil is incorrect (current is flowing outside of the coil) insulating boundary conditions must be added to ensure that the current stays within the coil. Since the solvers interpretation of the coil is incorrect (current is also flowing in the brass spool), insulated boundary conditions will be added. 

Right click > Add > Electromagnetic Conditions > Insulating. Click on the three inside faces of the brass spool. Hiding the coil geometry will make this step easier. 

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