How do V1/V2 and I1/I2 ratios relate to the left resistor in coupled coils?

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The impedance ratio of a transformer is equal to the square of the turns ratio.

So, in this case, the turns ratio is equal to 100 so the impedance ratio is 100 * 100 or 10000.

Ra was there before, so it is unchanged, but Rb is seen from the other side of the transformer as being increased by a factor of 10000.