physics question about turns on transormers?

Question

9.
*A transformer has 200 turns on the primary and 20 turns on the secondary. The primary is connected to a direct current source of 100 millivolts. The voltage in the secondary coil will be

Answer 1

Normally I would talk about the transformer equation

V1 / V2 = N1 / N2

but that's quite irrelevant if the voltage in the primary is direct current rather than alternating current. The answer to your question is that 0 volts will appear in the secondary.