Induction Heating 3-D simulation in COMSOL 4.2

Hello,
I'm trying to simulate the Induction Heating in 3-D simulation. Could you please tell me the components of Induction Heating (such as: Sufface Current, Ampere's Law, External Sufface Current Density...) which are necessary to be added in the 3-D model?

Thanks in advance.
With the best.
Phuong.