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Answer: A transistor is an electronic component that can either amplify or carry electrical signals or power in circuits, allowing it to be utilised in a wide variety of electronic devices. A transistor constructed by connecting two PN diodes back to back. It has three terminals: the emitter, the base, and the collector.
A bipolar junction transistor (BJT) is a current-controlled device that performs its job by utilising two PN junctions. There are also two depletion zones. The biassing condition applied to the connection determines the thickness of the depletion layer.
Hence the correct answer is 2nd.
