Lorentz force

["mercedes sampere" <m_veinti2@xxxxxxxxxxx>]

Hi femm users!
Could anybody tell me what does "2x frecuency force mean" when I ask for 
Lorentz force?
Ex:
Steady-state force:
x-component: -3.027513e-002 N/m
y-component: -1.022735e-004 N/m
2x Frequency force:
x-component: -3.011e-002 - j 9.877e-003 N/m
y-component: -1.059e-004 - j 5.189e-005 N/m

Thank you very much
Mercedes.

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