Transformers
A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is

0.85 V
1 V
0 V
1.7 V

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Transformers
An ideal transformer is one which has

core of stainless steel and winding of pure copper metal
no losses and magnetic leakage
a common core for its primary and secondary windings
interleaved primary and secondary windings

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