The correct label for the part of the transistor marked with an X is base.
What is transistor?
A transistor is a semiconductor device used to amplify the electrical signals and power. The transistor is one of the important part of modern electronics. It is consist of semiconductor material, have three terminals for connection.
In the place of mark X of a transistor, the arrow in the symbol indicates the direction of flow. There are three terminals called as emitter, collector and base.
The base is indicated by the mark X in the picture.
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