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Two winding transformer - DC bias-ed AC source on primary

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Hi, 
in Multisim 14.2 - Evaluation version, simulating the circuit with an ideal insulating transformer 1p1s, 10:10 turns (1:1 ratio). The transformer primary is excited with a 60Hz AC voltage source, and the secondary is closed through a 10 Ohm resistor.  

Q1: Why is my current in secondary changing when I add a voltage offset (DC bias) to the AC source?  

Q2: Why current flows in the secondary when the primary side is excited with a DC source only?  

 

Do I need to adjust the transformer model to properly handle the DC presents and how?  

 

Thank you in advance for help with Multisim  

Best,  

Alex (Dalian95) 

 

 

 

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