Phasor Diagram of No Load Ideal Transformer

[samieee]

For a no load ideal transformer

V₁ is anti phase with E₁?

or

in phase like this?

 

[samieee]

I have seen both types of phasor diagram in different books. But the first one is the accurate answer, I think. Because of Lenze's law.

 

[jim hardy]

It'll help you visualize the problem if you redraw the top figure to place both coils on same side of the core.

Make both coils less tall and move your secondary over to other side so it's just above the primary,
paying careful attention to preserve which direction the turns are wound.