CBSE > Class 12 > Physics | CBSE Board | Homework Help | myCBSEguide

No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

What is avalanche breakdown?

Posted by Ananya Dixit 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Sohan .G 6 years, 2 months ago

Zener method Is to dope higher than the normal doping i.e increase the electrons and holes which increases the voltage produced in the depletion region. This breakdown is known as Zener breakdown. Avalanches method is to dope lower than the normal doping i.e decrease the electrons and holes which decreases the voltage produced in the depletion region.This breakdown is called an Avalanches breakdown.

Ankit Devnda 6 years, 2 months ago

It is a phenomenon that can occur in both insulating and semiconducting materials. It is a form of electric current multiplication that can allow very large currents within materials which are otherwise good insulators. It is a type of electron avalanche. The avalanche process occurs when carriers in the transition region are accelerated by the electric field to energies sufficient to create mobile or free electron-hole pairs via collisions with bound electrons.

ANSWER

Why charge reside on the surface of the conductor

Posted by Prashant Kumar 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Questions of pratical

Posted by Rintu Yadav 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Yesterday i did't performed well in my chemistry preboard exam i think i'm going to fail and Tommorow i'm having physics and i'm very poor in physics subject can u help me to sort out some very important topics so that i could pass in physics Plz

Posted by Macherla Indupriya 6 years, 2 months ago

CBSE > Class 12 > Physics

6 answers

Priya Dharshini ? 6 years, 2 months ago

Do derivations and ncert solved questions...

Rashid Husain 6 years, 2 months ago

Do previous year question papers

Sanjana Joshi 6 years, 2 months ago

Optics contain 17 marke

Chetna Bhatt 6 years, 2 months ago

Just do derivations.....it will boost your score definitely! !

Adi Kumar 6 years, 2 months ago

Learn notes

Naina Khan 6 years, 2 months ago

Concentrate on optics it contains 23 marks

ANSWER

Is anyone began writing preboards at your respective scls?

Posted by Macherla Indupriya 6 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Ananya Dixit 6 years, 2 months ago

Yes

Macherla Indupriya 6 years, 2 months ago

Oh

Chetna Bhatt 6 years, 2 months ago

No.....mine is from 16th of December

ANSWER

Where we get the sample papers provided by cbse

Posted by Rashid Husain 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Ayushi Raj 6 years, 2 months ago

Cbse.nic.in

Utkarsh Goel 6 years, 2 months ago

In cbse website

ANSWER

How many mcq added in physics 2020 cbse board

Posted by Rashid Husain 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Gaurav Seth 6 years, 2 months ago

The model question papers and CBSE guess papers help the student to get better scores in the board exam. CBSE Students should practice Sample question papers as much as possible to get a better understanding of the concepts and to know the weak areas where you need to work a bit harder.

Click on the below link to all all the subject Sample papers to get an idea :

<a href="https://mycbseguide.com/cbse-sample-papers.html">https://mycbseguide.com/cbse-sample-papers.html</a>

Macherla Indupriya 6 years, 2 months ago

20

ANSWER

An electric potential of earth is zero because earth is a

Posted by Sandeep Yadav 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Macherla Indupriya 6 years, 2 months ago

Good conductor

ANSWER

ionized hydrogen atoms and a-particles with same momenta enters perpendicular to a constant magnetic field B. The ratio of their radii of their paths r H : a will be

Posted by Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

CBSE > Class 12 > Physics

7 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

??? ho gya tumhara. ?? Maine aese he puch liya tha.

∂Αяѕнαиαα ყα∂Αѵ ??? 6 years, 2 months ago

it's simple bro

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

?

Amol Gùpta 6 years, 2 months ago

Most welcome bhai ??

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

thanks

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

hmm

Amol Gùpta 6 years, 2 months ago

Is it 2:1

ANSWER

Which topics of ncert is cancelled out from syllabus?

Posted by Rashid Husain 6 years, 2 months ago

CBSE > Class 12 > Physics

4 answers

Jahnvi Sharma 6 years, 2 months ago

Transistor and communication is removed from cbse syllabus....

Aniket Pandey 6 years, 2 months ago

Transistor

Adi Kumar 6 years, 2 months ago

Communication system

Shraddha Verma 6 years, 2 months ago

Check it on cbse guide

ANSWER

It is important to solve ncert exemplar questions for cbse 2020 board. This type of questions come in board?

Posted by Rashid Husain 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Naina Khan 6 years, 2 months ago

Yes

ANSWER

Is Van de graff generator in syllabus cbse board?

Posted by Rashid Husain 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Ashish Jangir 6 years, 2 months ago

No

ANSWER

Is physics chapter 15 communication in syllabus 2020 cbse board?

Posted by Rashid Husain 6 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Jahnvi Sharma 6 years, 2 months ago

No , it is not in syllabus....

Ajeet Chaudhary 6 years, 2 months ago

No it's not in syllabus

Raj Yadav 6 years, 2 months ago

No

ANSWER

What do you mean by equivalent lens?The system of two equivalent lenses are placed it a distance then derive the expression of equivalent focus and power.

Posted by Prince Rahul 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Is communication coming in boards 2019-20 ?

Posted by Radhika Pareek 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Jahnvi Sharma 6 years, 2 months ago

No.... Not isyllabus. .

Saransh Mittal 6 years, 2 months ago

No

ANSWER

What is zener diode ? And its VI characteristics ?

Posted by Keshav Sarangal 6 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 6 years, 2 months ago

The semiconductor which is heavily doped to operate in reverse direction or in breakdown region.
The symbol for Zener diode is represented as below,

V-I Characteristics of Zener Diode

The diagram given below shows the V-I characteristics of the Zener diode. When the Zener diode is connected, in forward bias, diode acts as a normal diode. But Zener breakdown voltage occurs when the reverse bias voltage is greater than a predetermined voltage.

Shefu ??????? 6 years, 2 months ago

It is a special type of diode qhich works at high voltage without damaging circuit

ANSWER

Time period of charge q and mass m placed in e. F neglect effect of gravitational force

Posted by Gajendra Singh 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Is transitor as an amplifier topic is included in syllabus of 2019-20 ?????

Posted by Keshav Sarangal 6 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Rashid Husain 6 years, 2 months ago

Which chapter is that?

Arka Provo Sarkar 6 years, 2 months ago

No dude.

Abhay Chaturvedi 6 years, 2 months ago

Nahi, hat gaya hai

ANSWER

Where's physics project class 12??

Posted by Harshit Ranjan 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Mridul Ray 6 years, 2 months ago

Ask your physics teacher about the project .

ANSWER

Suggest some topic for investigatory project in pysics ??except ac generator and electromagnetic induction ?

Posted by Bhawna Pal 6 years, 2 months ago

CBSE > Class 12 > Physics

11 answers

Anushree Agarwal 6 years, 2 months ago

Refractive index of liquid

Satyam Dubey 6 years, 2 months ago

And gate ,or gate ,nand gate,and many gates

Parul Singh 6 years, 2 months ago

LDR

Bipin Yadav 6 years, 2 months ago

Rectifier

Shalini Maurya 6 years, 2 months ago

Diffraction of light

Adi Kumar 6 years, 2 months ago

Transformer led ldr

❄️ Queen ❄️ 6 years, 2 months ago

Dc generator....??

❄️ Queen ❄️ 6 years, 2 months ago

Hiii

Amol Gùpta 6 years, 2 months ago

Moving coil galvanometer

Sohan .G 6 years, 2 months ago

Fire alarm, water alarm, double split, rectifier, radio

Sohan .G 6 years, 2 months ago

Automatic street light

ANSWER

Why work done in moving a charge in space from one point to another is zero? There must be some force acting on it to move the charge so why 0 work done????

Posted by Ayushi Raj 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Achyut Singh 6 years, 2 months ago

Of course there is some work done by' you ' on the particle but no work done by you 'against' the electric field and thus electric potential energy is stored. And even in' presence of electric field' work will be done iff you make the particle move with constt. speed.

ANSWER

Why electric potential inside a charged spherical shell is constant? If electric field is 0 inside the shell potential should also be 0 and wht does it not depend upon r inside the shell???

Posted by Ayushi Raj 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Adi Kumar 6 years, 2 months ago

Electric current is zero

ANSWER

Majority charge careers in p-type semiconductor is

Posted by Awadhesh Kumar 6 years, 2 months ago

CBSE > Class 12 > Physics

6 answers

Priya Dharshini ? 6 years, 2 months ago

P for posotive charge that is holes.. n for negative that is electron...

John Le 6 years, 2 months ago

Majority carrier are positively charged holes

Mahira Sharma 6 years, 2 months ago

Holes

Muhammed Alfaizan 6 years, 2 months ago

The majority charge carriers in p-type semiconductor is holes.

Ashutosh Shrivastava 6 years, 2 months ago

Holes

Awadhesh Kumar 6 years, 2 months ago

Holes

ANSWER

Semiconductors obey Ohm's law at only low fields. Why?

Posted by Kartik Gupta 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Is cylindrical capacitor and spherical capacitor are. In syllabus of class 12th board

Posted by Adavya Kayasth 6 years, 2 months ago

CBSE > Class 12 > Physics

3 answers

Sunmeet Kaur Sachdeva 6 years, 2 months ago

No

Kunal M 6 years, 2 months ago

No

Řøhăň Řąjpůť ✌️✊ 6 years, 2 months ago

yes

ANSWER

Important graphs in chapter 11

Posted by Teeksha Singh 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A parallel plate capacitor is connected to another uncharged identical capacitor prove that energy of The combination is less than energy of single capacitor

Posted by Raju Hooda 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Write any six characteristics of nuclear forces

Posted by Khadar Vali 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Shefu ??????? 6 years, 2 months ago

Strong forces Independent of charge Spin dependent

ANSWER

two identical cells of EMF 1.5v each joined in series to an external circuit consisting of two resistance of 7 ohm each joined in series. A very high resistance voltmeter measures the Terminal voltage across each cell to be 1.4V . Calculate the internal resistance of each cell. Plzz do help as fast as possible it really urgent.

Posted by Me Souhardee❤️ 6 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How I make strategy of exam till rxam

Posted by Nikhil Kumar 6 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Ayushi Raj 6 years, 2 months ago

No strategy just ignore everything else and start studying time is so less now!!!

ANSWER

Page 158 of 739

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Google Play

Download myCBSEguide App