Atransformer 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:
a) zero.
b) 10 millivolts.
c) 20 millivolts.
d) 1000 millivolts.

B) 10 millivolts.

Explanation:

Given that

The number  turns on the primary side ,N₁ = 200 turns

The number  turns on the secondary side,N₂ = 20 turns

The voltage on the primary side ,V₁ = 100 m V

The voltage on the secondary side= V₂

We know that relationship between voltage and the number of turns given as

Now by putting the values

V₂ = 10 m V

Therefore the answer will be B.

B) 10 millivolts.