1.

What is the gain of the transformer in low-frequency region?

A. [N<sub>2</sub>/N<sub>1</sub>] [R<sub>L</sub> /(R+R<sub>L</sub> )].
B. [N<sub>2</sub>/N<sub>1</sub>] [R<sub>L</sub> /(R+R<sub>L</sub> +j L)].
C. A<sub>H</sub>=A<sub>0</sub>/ [1+( / H)<sup>2</sup>].
D. A<sub>L</sub>=A<sub>0</sub>/ [1+( / L)<sup>2</sup>]<sup>1/2</sup>
Answer» E.


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