The primary of a transformer when connected to a dc battery

The primary of a transformer when connected to a dc battery of 10 volt draws a current of 1 mA. The number of turns of the primary and secondary windings are 50 and 100 respectively. The voltage in the secondary and the current drawn by the circuit in the secondary are respectively

1. 20 V and 0.5 mA
2. 20 V and 2.0 mA
3. 10 V and 0.5 mA
4. Zero and therefore no current

A transformer is essentially an AC device. DC source so no mutual induction between coils
⇒ E₂ = 0 and I₂ = 0