Consider the two transistor analogy of ___

Consider the two transistor analogy of SCR, if α1 & if α2 are the common-base current gains of both the transistors then to turn-on the device

A. α1 + α2 should approach zero
B. α1 x α2 should approach unity
C. α1 – α2 should approach zero
D. α1 + α2 should approach unity

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Answer: D

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