[单选题]
The primary of a transformer has f o+asz7; k 6gjk6nbi8100 c:i l eae61;wbturns and its secondary has 200 turns. If the power input to thewa eibc :le;16 primary is 100 W, we can expect the power output of the secondary to be (neglecting frictional losses)
A. 50 W.
B. 100 W.
C. 200 W.
D. none of the given answers
