Question: 100% NCERT covered from Particular Keyword.Explanations are 100% from NCERT | [Difficult level: Easy] From NCERT NEET Derived Question.
In a transistor, the base is
(a) a conductor of low resistance
(b) a conductor of high resistance
(c) an insulator
(d) an extrinsic semiconductor
Answer:
A transistor is a semiconductor device. It usually has three terminals. That is, emitter, base and collector. It is a three terminal device which has two p-n junctions. These two p-n junctions are placed back to back in a single piece of semiconductor material. Mainly there are two types of transistors. They are bipolar junction transistor and field effect transistor. An npn transistor is formed by sandwiching p-type material between two n-type materials. Similarly, a pnp transistor is formed by sandwiching n-type material between two p-type materials. BJT (bipolar junction transistor)is a three terminal device. They are emitter, base and collector.
Emitter region usually supplies charge carriers to other two regions. Usually, the emitter is heavily doped. In npn transistors, the emitter supplies free electrons to the junction. Collector is usually used to collect charge carriers. Collector is the largest part of a transistor rather than the emitter and base. The doping of the collector is intermediated between the emitter and base.
Hence, option (D) is correct.
Transistor
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