Instasolv

IIT-JEE NEET CBSE NCERT Q&A

4.5/5

# Xam Idea Class 12 Physics Chapter 14 Solutions: Electronic Devices

Xam Idea Class 12 Physics Solutions for Chapter 14 ‘Electronic Devices’ are of great use for preparing for CBSE Class 12 exams along with competitive exams like JEE and NEET. These solutions are based on concepts of electronic devices that include insulators, semiconductors, conductors, logic gates, I-V characteristics of LED, photodiode, Zener diode, and solar cell. There are several formulas in this chapter that describe the relationship between emitted current, base current and collector current learning which will help you to solve numerical easily. Going through our Xam Idea solutions for Class 12 Physics Electronic Devices will surely assist you in gaining in-depth knowledge of all concepts of this chapter.

Xam Idea Class 12 Physics Solutions for Electronic Devices consist of 125 questions that are divided into four sections. These are very short answer type questions, short answer type questions (I and II) and long answer type questions. Every section of questions will cover all important concepts of the chapter that will assist you in making fundamentals very strong in the chapter. The questions are both theoretical as well as numerical. The questions present in the chapter are mainly based on charge carriers in p and an n-type semiconductor, depletion layer, distinguishing between metal and insulator based on energy band diagrams, drawing output waveform when inputs are given in logic circuit, extrinsic and intrinsic semiconductors, and energy band.

Our experts at Instasolv will help you with easy and reliable solutions for Xam Idea Class 12 Physics. Our team of experts is highly skilled with several years of experience and they offer stepwise solutions from a student point of view. Their main aim is to make your concepts clear and assist you in solving and answering questions easily and rapidly. The vocabulary we use is very easily understandable and our resources are available for you free of cost.

## Important topics for Xam Idea Class 12 Physics Solutions Chapter 14: Electronic Devices

Semiconductors: These are basic materials that are used in some of the solid-state electronic devices like diodes, ICS, transistors etc. Semiconductors have a resistivity of intermediate level to current.

Intrinsic Semiconductor: This is a pure semiconductor where the electrical conductivity is entirely governed by electrons that are excited from valence band to the conduction band and there is no impure atoms addition for increasing the conductivity. The electrical conduction in these semiconductors is done through electron-hole pairs. In an intrinsic semiconductor-

ne -nh = ni where ne = the free electron density in the conduction band, nh = the hole density in the valence band, and ni = the intrinsic carrier concentration.

Extrinsic Semiconductor: It is a type of semiconductor that is dope with impure atoms to enhance conductivity. They are of two type’s n-type semiconductors and p-type semiconductors. In n-type semiconductors, the electrons are the major carriers of charge and holes are the minor and charge carriers and the vice versa in a p-type semiconductor.

Diode: It is a semiconductor device having two terminals that allow the unidirectional flow of current. One of the important diodes is the p-n junction diode. When this junction is created a layer called depletion layer is formed that consist of immobile ion cores lacking their holes and electrons. This results in a junction potential barrier.

I-V characteristics Curve: It is drawn because, by alteration of the externally applied voltage amount, there is alteration of the junction barriers. In forwarding bias, the barrier reduces while in reverse bias the barrier increases.

Some special circuits handle the digital data consisting of 0 and 1 levels. This makes the subject of digital electronics.

Logic Gates: These are the digital circuits that are responsible for some of the special logic operations. This includes AND, NOR, OR, NAND and NOT gates.

### The Relation Between Emitter Current, Base Current and Collector Current is

IE=IB + IC where IE is emitter current, IB is base current and Ic is collector current.

Transistor Action: When the emitter-base junction in an NPN transistor is forward biased, the electrons are then pushed in the direction of the base. When I0 is the base current, there are three configurations of a transistor. They are common-base (CB) circuit, common-emitter (CE) circuit, common-collector (CC) circuit.

### Exercise Discussion for Xam Idea Class 12 Physics Solutions Chapter 14: Electronic Devices

Chapter 14 of Xam Idea Class 12 Physics Solutions on electronic devices consist of a total of 125 solved questions. These questions are prepared in compliance with the recent NCERT syllabus and the pattern of CBSE that will help you in scoring higher marks in examinations. The whole set of problems are divided into four sections.

• There are about 50 very short answer type questions which you have to answer in one line. They all have been designed to make your concept very clear in minute details of the chapter.
• There are 10 previous years questions based on the depletion layer, logic gates, I-V characteristics, p-n junction, and temperature dependence of resistivity.
• Then, there are 40 questions based on semiconductor materials, charge carriers in p and n-type semiconductors, Transconductance of the transistor.

Short Answer Type Questions (Type- I)

• Under this section, there are 28 questions in total. This section of questions is 4-5 line answer questions.
• There are about 15 questions based on differentiating between metal and insulator based on energy bands, n-type and p-type semiconductors, drawing energy band diagrams and identifying the logic gates.
• Some questions are based on the difference between forward biasing and reverse biasing in a p-n junction, drawing truth table for the logic circuit.
• Then there are 13 questions based on the minimum voltage of the battery, diodes, resistivity for safe operation.

• Under this category, there are 31 questions in total.
• The questions are asked on concepts of the chapter like integrated circuit, diode resistance, the logic gate of a complete circuit, semiconductor under reverse bias, dynamic output resistance.
• Then, there are 12 questions and mainly covers resistivity of the transistor, Zener diode, Photodiode, input resistance.