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  4. Two P N junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will be

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Q. Two $P N$ junctions can be connected in series by three different methods as shown in the figure. If the potential difference in the junctions is the same, then the correct connections will bePhysics Question Image

Semiconductor Electronics: Materials Devices and Simple Circuits

Solution:

Because in case (1), $N$ is connected with $N$. This is not a series combination of transistor.