In the Eddy Current (frequency domain) solver, J_vector is a complex vector with real, imag components in 3 spatial directions: Jx, Jy, Jz.

1) Using the calculator, Mag_J returns real component of SQRT (Jx^2 + Jy^2 + Jz^2).

2) Ohmic loss uses J_vector and is defined as: integral (J_vector dot J_vector(conj) /2 conductivity) dV (Reference formula in Maxwell online help topic “Ohmic Loss for an Eddy Current Solution&rdquo