What is the magnitude of mutually induced emf, E2 in a transformer?

What is the magnitude of mutually induced emf, E2 in a transformer? Correct Answer directly proportional to rate of change of flux and number of secondary turns

Due to the supply voltage, a secondary induced emf is produced. V1 is in antiphase with E2 and the magnitude of E2 is proportional to rate of change of flux and number of secondary turns.
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