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

If they cross then there will be two tangents at that point the tangent gives the direction on the test charge but force cannot be in two directions at a point that is why

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Nn Nn 5 years, 7 months ago

Tdxoufxut8ccyxtixittciycyiv8

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Abe english padh lo sab ke sab.???

Posted by Arnav Kandari 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Shivani Thakur 5 years, 7 months ago

Btt abi to physics pdh lo sb k sb .....physics....physics.....physics??????????????????

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

shi baat hai.

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ANSWER

Explain cyclotron working principle

Posted by Rishu Rawat 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Roshan Shukla 5 years, 7 months ago

Charged particles can be acclerated to high energy levels by passing them through a moderate electric field,this can be done by a perpendicular magnetic field which will through the particle in a circular motion. This goes on and the particle gains enough energy and get excited to higher energy level and exits the system to hit the desired target....

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Tamanna Sharma 5 years, 7 months ago

It's very simple.....+ vely charge particle can accelerate with high energy ? with the help of oscillating electric field ? and in some journey with magnetic field.

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ANSWER

Why wave theory of light is not able to explain the observed features in photoelectric effect???

Posted by Tapan Pandey?? 5 years, 7 months ago

CBSE > Class 12 > Physics

3 answers

Arnav Kandari 5 years, 7 months ago

Uff Itne bade bade answers ??

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Yogita Ingle 5 years, 7 months ago

Photoelectric effect cannot be explained acoording to wave theory because of follwoing reasons:
1. According to wave theory, after the light falls on a substance electrons are emitted after a small instant of time. However, in photoelectric effect, the electron emissions are immediate without a time delay.
2. The energy of a wave increases with increase in intensity. However, in photoelectirc effect, increase in intensity has no effect on the energy of electrons emitted. All that happens is the number of electrons emitted, increases.

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

becoz it can't explain (i) the instantaneous ejection of photoelectron . (ii) the existence of threshold frequency for a metal surface. (iii) the fact that K. E of emitted electron is independent of the intensity of light and depend upon its frequency.

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A current of 4A flows in a coil when connected to a 12V DC source, If the same coil is connected to a 12V 50hz AC source, a current of 2.4A flows in the circuit. Calculate the self inductance of the coil

Posted by Laya Sundeep 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Roshan Shukla 5 years, 7 months ago

12 mH

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I'm tensed about physics exam ! Is sample paper enough to get pass marks ? Plzz reply me fast

Posted by Varalaxmi Sereginedi 5 years, 7 months ago

CBSE > Class 12 > Physics

4 answers

Arnav Kandari 5 years, 7 months ago

All you can do is pray to god and rely on your luck. Amen.???

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Aditya Gupta 5 years, 7 months ago

Sample papers are enough to pass the examination but as per your luck but if you learn only definations of your course then you will definately pass out

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Tamanna Sharma 5 years, 7 months ago

Sample paper + toppers answer sheet 5 years enough

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Tamanna Sharma 5 years, 7 months ago

Don't be so tensed, arre yar physics baddi he ya hmm, definitely hmm sab na ,so be calm and lets together rock in exams,,????good luck

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ANSWER

Can u plz tell me imp derivations?

Posted by Nidhi Mahajan 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Arnav Kandari 5 years, 7 months ago

Noooooooooo.???

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Abcd Xyz 5 years, 7 months ago

refer to AMAN DHATTARWAL

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ANSWER

The ratio of light of wavelength 4000A and 8000A vacuum is

Posted by Rishu Pandey 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Param Dhingra 5 years, 7 months ago

Both being EM wave will travel at same speed in vacuum . (speed = 3×10^8)

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Param Dhingra 5 years, 7 months ago

1:1

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What are high weightage lessons for numericals?

Posted by S. Vedhashree 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Its All About 5 years, 7 months ago

Current electricity

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ANSWER

State two advantages of reflecting telescope over a refracting telescope

Posted by Rishu Rawat 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Param Dhingra 5 years, 7 months ago

1. Lighter in wieght 2. No chromatic abbreviations

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Tamanna Sharma 5 years, 7 months ago

No chromatic abbreviations. 2. Image is more resolved

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ANSWER

Important in physics please tell

Posted by Vimal Pathak 5 years, 7 months ago

CBSE > Class 12 > Physics

6 answers

Varalaxmi Sereginedi 5 years, 7 months ago

????

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Manjay Jha 5 years, 7 months ago

Jist go through every laws and derivation.

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Vimal Pathak 5 years, 7 months ago

Aryaman rehnede bhai apna hi padh lena bhut Bdi baat hai

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Vimal Pathak 5 years, 7 months ago

Neha/ it's ok

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Aryaman Singh 5 years, 7 months ago

2 march ko bta dunga...

2Thank You

Neha Pathak 5 years, 7 months ago

Hmne paper nhi bnaya??

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ANSWER

Define dielectric charge

Posted by Helen Samitha 5 years, 7 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why on increasing temperature , width of depletion layer increases in a junction diode

Posted by Param Dhingra 5 years, 7 months ago

CBSE > Class 12 > Physics

3 answers

Ayu Sharma 5 years, 7 months ago

Reverse bias

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Tamanna Sharma 5 years, 7 months ago

Acc to the relation,,,,,,, w.depletion =root(2epsilon/ q {1/Na +1/ Nb} Vb),,,,,,,,here Vb is barrier potential directly proportional to the temp( thermal voltage) and hence as T increasing width of depletion layer is also increasing,,,but for specific change or selectivity of a semiconductor model we have to know either it is forward or reverse biased because ideality factor change acc to varying temperature levels

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Tamanna Sharma 5 years, 7 months ago

In which case forward or reverse biased

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Which book i should for mcqs of board exam in physics

Posted by Sumitra Khatri 5 years, 7 months ago

CBSE > Class 12 > Physics

3 answers

Sarthak Nahar 5 years, 7 months ago

Together with

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Saurabh Sharma 5 years, 7 months ago

The bestest book is ncert exemplar and nothing else......

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All About Utkarsh 5 years, 7 months ago

Chspterwise

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Why electro field is more at sharp edges near of conductor

Posted by Sumitra Khatri 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

__I.Am.Shyam. Jaat?__ 5 years, 7 months ago

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Derive the relation between f and r for convex mirror

Posted by Vignesh Babu 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Riya Rana 5 years, 7 months ago

R=2f

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ANSWER

Nuclear force is strongly attractive at the distance between two nutrinos is 1fm or 0.8 fm????

Posted by Tapan Pandey?? 5 years, 7 months ago

CBSE > Class 12 > Physics

23 answers

Tapan Pandey?? 5 years, 7 months ago

Is bar wrong h????

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

darshana yadav ki theory air andaza Dono kabhi wrong nhi hote. ? ????bus kabhi kabhi idhr udhr ho jaate h but wrong nhi bilkul nhi. ?

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Tapan Pandey?? 5 years, 7 months ago

And, ? According to my theory , you are wrong ??? theory ..... good one!

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Tapan Pandey?? 5 years, 7 months ago

Nooo............???sach me meri preparation is equal to NIL

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

??? sharm karo tum jhooth bol re hoo iss tym bhi tum physics pdh re hoo. aur bol re ho kuch ni aa ra. according to my theory tumhari puri prepare ho gyi h.. am I r8 na.?

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Tapan Pandey?? 5 years, 7 months ago

Yaar sample paper me bhi toh kuch aaye to na

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

yup bro all are tensed but.. tension mein kuch na rkha.. by practicing sample paper we will surely overcome our fear. ✌️

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Vinay Gautam 5 years, 7 months ago

Ya sis lm also tensed about it

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Tapan Pandey ?? 5 years, 7 months ago

Physics matlab darr hi hota h???

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

hnn ye bhi h... mujhe bhi bus physics ka dar h..

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Tapan Pandey?? 5 years, 7 months ago

English jaise subject me to ab sab kuch keh sakte h?

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Tapan Pandey?? 5 years, 7 months ago

Physics paper achaa chala jaye bs......?

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

lgta h kuch zyda puch liya. ??

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

mtlb A to Z sub mtlb sub mtlb ke aub kuch means sub kuch.

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

sare cheaters ho gye physics ke??

2Thank You

Tapan Pandey?? 5 years, 7 months ago

Sab sample papers ka kamal h???

1Thank You

Tapan Pandey?? 5 years, 7 months ago

Nahi yaar

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Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

tej chl re ho. ???

2Thank You

Tapan Pandey?? 5 years, 7 months ago

English kl se bs revision karna h

1Thank You

Ďãřşháñăã Yadav ? ? ? 5 years, 7 months ago

tum English ni pdh re ?... physics pdh re ho bura mat manna bus avian puch liya. ? but fir bhi English nhi pdh re physics pdh re ho?

2Thank You

Tapan Pandey?? 5 years, 7 months ago

1Thank You

Muskaan Vig 5 years, 7 months ago

Sorry 0.8 fm is radius of nucleons ......1fm is correct answer.

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Muskaan Vig 5 years, 7 months ago

0.8 fm

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ANSWER

Coulmb law

Posted by Musharraf Perwez 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Kanishk Yadav 5 years, 7 months ago

It is valid for point object.

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Manjay Jha 5 years, 7 months ago

States that the magnitude of force of interaction os directly proportional to the product of magnitude of charges and inversely proportional to square of distance between them.

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ANSWER

How to prepare phy. In 6 days and which chapters i do first to get good marks in 2020 board xam

Posted by Amjad Ali 5 years, 7 months ago

CBSE > Class 12 > Physics

3 answers

Amjad Ali 5 years, 7 months ago

Thankuuuh?

2Thank You

Muskaan Vig 5 years, 7 months ago

First do optics, then do AC,magnetism these chapters carry max weightage ....

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Tamanna Sharma 5 years, 7 months ago

I think now you have start preparation from last chapter in a reverse order.

2Thank You

ANSWER

Are logic gates in syallabus?

Posted by Pk Rabari 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Sulekha Singh 5 years, 7 months ago

1Thank You

ANSWER

How much number of numerical asked in board exam

Posted by Shivam Pandey 5 years, 7 months ago

CBSE > Class 12 > Physics

4 answers

Ayu Sharma 5 years, 7 months ago

30 marks numerical

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Neha Sandilya 5 years, 7 months ago

Only 10 to 12 marks

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Tamanna Sharma 5 years, 7 months ago

So weightage is about 2o-25 marks

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Tamanna Sharma 5 years, 7 months ago

2 in 5 marks( optional with derivation and all). ,,,,,2 for 3 marks ,,,1-2 in 2marks,,,andin 1 marker their is possibility also but they quiet be easy.( l think tricky question based on application will be there in 1 marker.)

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ANSWER

State hookes law and modules of elasticity

Posted by Ankur Hirekhan 5 years, 7 months ago

CBSE > Class 12 > Physics

2 answers

Apoorva Rao 5 years, 7 months ago

Magar ye to 11ka question hain

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Tamanna Sharma 5 years, 7 months ago

Extension of spring is directly proportional to the load applied to it. Modules of elasticity = stress/ strain ( 3 types- youngs modulus, shear modules, bulk modules)

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What is hygiene principal

Posted by Kartikesh Jha 5 years, 7 months ago

CBSE > Class 12 > Physics

1 answers

Muskaan Vig 5 years, 7 months ago

Huygens principle states that every point on wavefromt is source of new disturbance called secondary wavelets..these secondary wavelets spread in all direction with speed of light and add upto to form a new wavefront later....

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What is hygiene principal

Posted by Kartikesh Jha 5 years, 7 months ago

CBSE > Class 12 > Physics