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Consider a 2-winding transformer as below. If the switch is kept open then the emf induced across the secondary having transformation ratio of ‘2’ is?

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Consider a 2-winding transformer as below. If the switch is kept open then the emf induced across the secondary having transformation ratio of ‘2’ is?

(a) zero

(b) 2E1

(c) E/2

(d) E1

The question was asked by my school principal while I was bunking the class.

I'd like to ask this question from Ideal Two Winding Transformer in chapter Transformers of Electrical Machines

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The correct choice is (a) zero

To explain I would say: The induced emf lags the flux by 90degrees.

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