The primary of a transformer is connected to a steady DC battery of 15 V. The number of turns in the

Question

The primary of a transformer is connected to a steady DC battery of 15 V. The number of turns in the primary and secondary windings are 50 and 100, respectively. The voltage induced across the secondary coil is

Professor PC Thomas Classes · Answer

(c) : A transformer operates strictly on the principle of Faraday's law of electromagnetic induction, which requires a continually changing magnetic flux. A steady DC battery provides a constant current, producing a constant magnetic flux. Since $d\phi/dt = 0$, no electromotive force (EMF) is induced in the secondary coil. Thus, $V_s = 0$.