coupled application

This is kumar,can anybody help me to implement the coupled application about electromagnetic flow meter to solved the flow rate analysis- for analysis this device i have a some clarification also,

1. In which module i have to choose for giving the magnetic field
2.how i can couple this application with fluid flow in inside pipe.

here i attached the file which is regards to this above problem,please help me out of this problem


thank you,
N.Kumar