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a transistor is called a Bi-polar device because in this we use both p-type semiconductor and n-type semiconductor.

In p-type semiconductor the current flows with the help of holes(deficiency of an electron or we can say it as a positive charge).

while in n-type semiconductor the current flows with the help of electrons(negatively charged particles).

so the total current is due to both kind of charge carriers.

that's why it is known as a Bi-polar device.

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