Question

FET
③ why FET is called unipolar Device?​

Answer 1

Answer:

Why is FET known as a unipolar device?

All FETs can be called UNIPOLAR devices because the charge carriers that carry the current through the device are all of the same type i.e. either holes or electrons, but not both. This distinguishes FETs from the bipolar devices in which both holes and electrons are responsible for current flow in any one device.

Explanation:

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Answer 2

FET stands for "Field Effect Transistor".

It is a 3-terminal semiconductor device.  The three terminals are, namely, Gate, Source and Drain. FET is a voltage-controlled device.

FET is known as a unipolar device because the current flow through it is controlled by only a single type of charge carrier, either electrons or holes.