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Transformers - Engineering

Q1:

When a 6 V battery is connected across the primary of a transformer with a turns ratio of 8, the secondary voltage is

A 0 V

B 6 V

C 48 V

D 0.75 V

ANS:A - 0 V

For an emf to be induced, the magnetic field has to constantly change according to Faraday's law of electromagnetic induction. DC does not change as such the magnetic field will remain constant and no emf is induced.