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

Yes i noticed in the previous year question paper eg. electrostatic induction u can also check in this app physics previous year question paper set 3 go and check guys becoz this topic is not in the syllabus of 2018-19

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Shubham Kumar Gupta 6 years, 6 months ago

If ncert uses on single word which is of different cocept ....then it will ask....

1Thank You

Priya Dharshini ? 6 years, 6 months ago

Out of syllabus.. i dont think so it came.. r u sure about it.. i never heard of it. If it is truly out of syllabus they mostly give grace marks... but still it is better to learn more than what is there in text book for our safety of marks... no need to risk any topic..

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ANSWER

What is superposition

Posted by Nishant Gautam 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Sia ? 6 years, 6 months ago

The superposition principle states that the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.

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Riti Bansal 6 years, 6 months ago

The space around which another mass can experience by it

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Question

Posted by Rupa Yadav 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Does moment of inertia depends on speed of rotation?

Posted by Muskan Sokhal 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Ashutosh Yadav 6 years, 6 months ago

It will only change when there will be change in the reference point i.e. the point from which we are considering the value of "R"

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Ashutosh Yadav 6 years, 6 months ago

No Since I = MR²

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ANSWER

When cbse board release cbse sample paper 2019_20

Posted by Aman Singh 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sumit Kumar Verma 6 years, 6 months ago

in september either in 1st or 2nd week

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ANSWER

Derive emf,current, force and power for rotational motional emf

Posted by Nithin Nirel 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Which are most important theorem or topics that i should learn for cbse 12th physics

Posted by Sameer Nehra 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Khuskaran Sidhu 6 years, 6 months ago

Photoelectric equations & energy equivalence for 1 a.m.u.

1Thank You

Khuskaran Sidhu 6 years, 6 months ago

Expression for Electric field intensity at axial or equatorial due to an electric dipole

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Abhay Gupta 6 years, 6 months ago

Meterbridge,drift velocity,

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ANSWER

Write properties of the material used as a suspension wire in a moving coil galvanometer.

Posted by Subhangi Rout 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Abhay Gupta 6 years, 6 months ago

Phosphorus bronze wire

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A small telescope has an objective lens of focal length 144cm & eye piece of focal length 6cm.What is the magnifying power of telescope?

Posted by Josna Mary Thomas Thomas 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

Given, focal length of objective lens, f₀= 144 cm
Focal length of eyepiece, f_e = 6 cm
Magnifying power of the telescope in normal adjustment,(i.e. when the final image is formed at {tex}\infty{/tex})
M = {tex}- \frac { f _ { 0 } } { f _ { e } } = - \frac { 144 } { 6 } = - 24{/tex}

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ANSWER

State ampere's circuit law. Use this law to obtain the expression for the magnetic field inside an air cored toroid of average radius r, having n turns per unit length and carrying a steady current I

Posted by Khushbu Verma 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is temperature coefficient and drift velocity

Posted by Poonam Ratrey 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Premesh Tyagi 6 years, 6 months ago

The velocity with which free electrons move in a conductor on application of potential difference is called Drift velocity

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Abhay Gupta 6 years, 6 months ago

Temperature coefficient is = Ro - R\dTheta

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Pritesh Purohit 6 years, 6 months ago

drift velocity is the average velocity through which an electron drifts towards the positive end of the conductor.

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Three identical cells ,each of emf 2V and internal resistance 0.2 ohm ,are connected in series to an external resistor of 7.4 ohm.calculate the current in circuit and the terminal potential diffrence across an equivalent cell.

Posted by Aishwarya Panda 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Dr.Niraj Kumar 6 years, 6 months ago

Net EMF of the cell=2*3=6
Total resistance o the circuit=0.2+0.2+0.2+7.4=8
Therefore,I=nE/R+nR=6/8=0.75A

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ANSWER

I need the list of formula for vrms, z,cosx chapter 7 physics..

Posted by Priya Dharshini ? 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

there is1 more capacitive reactance. nd instead of resistance it's reactance

1Thank You

Priya Dharshini ? 6 years, 6 months ago

I need important formulae to check whether i missed any..

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Priya Dharshini ? 6 years, 6 months ago

EXcusme if u know u say.. otherwise i just no need these comments..?

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ANSWER

what is thermodynamics

Posted by Sudhanshu Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Sagar Gupta 6 years, 6 months ago

Yar twelth me thermodynamics toh hai hi nahi

1Thank You

Yogita Ingle 6 years, 6 months ago

Thermodynamics:- It is the branch of physics which deals with process involving heat, work and internal energy. Thermodynamics is concerned with macroscopic behavior rather than microscopic behavior of the system.

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ANSWER

State amperes circuital law use this law to obtain the expression for the magnetic field inside an air cored toroid of average radius r having n turns per unit lenght and carrying a steady current

Posted by Rose Rosy 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is dielectric strenght

Posted by Vatsalya Trivedi 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Dr.Niraj Kumar 6 years, 6 months ago

the maximum electric field that the material can withstand under ideal conditions without breaking down (i.e. without failure of its insulating properties).

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Rose Rosy 6 years, 6 months ago

A substance that is poor conductor of electricity but an efficient supporter of electrostatic field

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A maganetising field of 1500A/m produces a flux of 2.4*10*-5 Weber in an iron bar of cross sectional area of 0.5cm2. Calculate the relative permeability and susceptibility of iron bar used.

Posted by Pratheeksha P Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

When a potential diff. Is applied across the ends of a conductor,how is drift velocity of the electrons related to relaxation time.

Posted by Lovey Rana 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Dr.Niraj Kumar 6 years, 6 months ago

from the relation vd=eEmT (T is the relaxation time) we can say that the drift velocity is directly proportional to the relaxation time

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ANSWER

Do mass transfer with the transfer of charge?

Posted by Payal Seth 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Premesh Tyagi 6 years, 6 months ago

Yes

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Nishu Sahu 6 years, 6 months ago

Yes as the charge has some mass so when it get transfer some mass also get transfer.

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Dr.Niraj Kumar 6 years, 6 months ago

Yes

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ANSWER

Currently i am in class 12 n got only marksheet of class 10th not cirtificate from same skl which i am currently studying why??? Is there any rule that time of distribute only marksheet to students...

Posted by Arunima Devi 6 years, 6 months ago

CBSE > Class 12 > Physics

4 answers

Sagar Gupta 6 years, 6 months ago

Ya i also got certificate and marksheet seprately from the school You must inform at the reception

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Priya Dharshini ? 6 years, 6 months ago

Ur marksheet is only ur certificate...

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Arunima Devi 6 years, 6 months ago

Bt i don't get my certificate only marksheet i got

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Priya Dharshini ? 6 years, 6 months ago

I didnt understand ur question... u got ur marksheet right, from the school u studied ur class 10th. Then what problem u have.. ?

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ANSWER

Why like charges repeal each other?

Posted by Ankit Kumar 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Priya Dharshini ? 6 years, 6 months ago

Because of coulomb force..

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Yogita Ingle 6 years, 6 months ago

This is due to the coulomb's law ie
{tex}\frac1F=\;\frac1{4\mathrm\pi\in\mathrm o}\frac{q_1q_2}{r^2}{/tex}
This is called coulomb force and it acts along the line joining the particles. If charge 1 and 2 are of same nature ,the force is repulsive otherwise it is attractive.

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Pattern of paper in 2019-20

Posted by Ishwar Chand 6 years, 6 months ago

CBSE > Class 12 > Physics