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

The main reason behind the failure of automobile ignition is the decrease in the ionisation of the electrolyte present in the battery. This is because ionisation of an elcctrolyte is directly proportional to the temperature which surrounds it. Hence in damp weather it the process fails.

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Why is electric field lines are continous curve and don't have sudden breaks

Posted by Reena Sharma 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Aditya Chauhan 5 years, 10 months ago

An electrostatic field line is a continuous curve because a charge experiences a continuous force when traced in an electrostatic field. The field line cannot have sudden breaks because the charge moves continuously and does not jump from one point to the other.Nov

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Relation between linear momentum and kinetic energy ?????

Posted by Shivangi Mishra 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Harshit Tomar 5 years, 10 months ago

Kinetic energy =k Linear momentum =p Mass of body =m K=(mv^2)/2 Now multiply and divide by m K=(mv)^2/2m As p=mv Therefore k=(p^2)/2m

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Two metals A and B have work function 3eV and 6 eV respectively. Which metal has lower threshold wavelength.

Posted by Garima Dhami 5 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Nishu Sahu 5 years, 10 months ago

6ev bcz greater the work function ,greater is threshold frequency and less is threshold wavelength.

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Shivang Sharma 5 years, 10 months ago

3ev

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A wire of uniform cross section and length 'l' has a resistance of 16 ohm. It is cut into four equal parts. Each part is stretched uniformly to initial length and all four stretched parts are connected in parallel. Calculate the total resistance of the combination so formed. Assume that stretching of wire does not cause any change in the density of its material?

Posted by Mayank 007 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Pooja Deora 5 years, 10 months ago

New resistance of each wire will be r= n^2R R=4. (16/4) Wire should be 4 times strectched so n=4 r=4×4×4=64 Net resistance=64/4 =16

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A simple voltaic cell has an emf of 1.0 V. is there a net field inside the cell when:---> (i)circuit is open (ii) circuit is closed and a steady current is drawn from it? Explain your answer in each case?

Posted by Mayank 007 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Shivang Sharma 5 years, 10 months ago

1-no ef will be present 2-ef will be present

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How a zener diode is fabricated??

Posted by Riya Kumari 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Nishu Sahu 5 years, 10 months ago

Heavily doping on both p-and n- side of the junction.

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Can anyone tell me how to complete the whole syllabus in 6 days

Posted by Neha Chandravanshi 5 years, 10 months ago

CBSE > Class 12 > Physics

4 answers

Ankita Kaundilya 5 years, 10 months ago

Ï think JO JO mai exercices ka main main topic h to usko dekh lo

1Thank You

Soumya Kumari 5 years, 10 months ago

Agar bas pass hona hai ur tumhara ratta marne ka power acha hai to my cbse guide ka notes rattta mar lo. This is Not for main subject

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Soumya Kumari 5 years, 10 months ago

Agar 1 sal me aek bar bhi book nahi kholi ho to bhagwan ko pray karo ki kaise bhi pass ho jaye

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Soumya Kumari 5 years, 10 months ago

Take your book, open it ,and revise.

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About question bank

Posted by Abhinav Shukla 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is pascals law

Posted by Tajmeen Saifi 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Flux KYa h

Posted by S'On' Of Sardar 5 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Devyani Malvi 5 years, 10 months ago

The perpendicular lines present on any closed mrtal surface known as FLUX

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Avichal Yadav 5 years, 10 months ago

Flux is the number field lines passing through any given CLOSED surface area..

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Roshan Jha 5 years, 10 months ago

Total number of field lines passing through the surface normally is called flux

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I think we can simply write d question number in d left out questions at d end......agr by chance question galat hi toh uske grace marks b mil sakte hi !!!!!

Posted by Ayaan Ali ?? 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Property of conservation of charge

Posted by Srishty Sidana 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Avichal Yadav 5 years, 10 months ago

charge can not be created nor be destroyed.. It is always quantised.

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Explain how corpusular theory predicts that spewd of light in a medium ,say water ,is greater than the speed of light in vaccum..

Posted by Rittika Attri 5 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Rittika Attri 5 years, 9 months ago

Tq☺

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Ritwik Choudhary 5 years, 10 months ago

Newton’s corpuscular theory of light states that when light corpuscles strike the interface of two media from a rarer (air) to a denser (water) medium, the particles experience forces of attraction normal to the surface. Hence, the normal component of velocity increases while the component along the surface remains unchanged.

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Avichal Yadav 5 years, 10 months ago

Answer is long .. so I can provide its solution if you are on any social media

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Solution of classs12 physics paper 2017 all india

Posted by Asma Jamal 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to do physics in 3 days between exam

Posted by Neha Chandravanshi 5 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Avichal Yadav 5 years, 10 months ago

Go on you tube and see the aman dhattarwals 30 day schedule it will help too much in arranging whole syllabus in given time

2Thank You

Vavi Neeraja 5 years, 10 months ago

Prepare sample question paper clearly.Do cbse board questions and read Ncert textbook and try to do Ncert textbook question

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Vinay Gautam 5 years, 10 months ago

Exam idea complete

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In magnetic effect of current chapter definition of fleming left hand rule and other rules are asked or not

Posted by Adavya Kayasth 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Niranjan Prajapati 5 years, 10 months ago

Probability of asking is less than 1%.

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numericals kitne marks ke aayege estimated..?

Posted by Râhūl ;-),?? 5 years, 10 months ago

CBSE > Class 12 > Physics

5 answers

Roshan Jha 5 years, 10 months ago

Approximate 15-16 marks

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Vemula Chowdary 5 years, 10 months ago

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Saurabh Dhaundiyal 5 years, 10 months ago

45-50

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O O 5 years, 10 months ago

10-15

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Rahul Malik 5 years, 10 months ago

1Thank You

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Is effect of temp on the mobility and conductivity of electrons and holes in our syallabus

Posted by Shefu ??????? 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Chetan Yadav 5 years, 10 months ago

Yes

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A steam of electron travelling with speed v m/s at right angle to the uniform electric field E is deflected in a circular path of radius r proov that e/m=v²/rE

Posted by Hopeful Things Of Life 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A concave mirror and a convex lens held separately in water. What changes if any do you expect in the focal length of either?

Posted by Garima Dhami 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Riya Rana 5 years, 10 months ago

The focal lenght of mirror does not change with the change in the medium nut there is a change in the focal lenght of lens (it decreases).

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Whether additional exercises of physics will come in board exam 2020

Posted by Arkaprabha Roy 5 years, 10 months ago

CBSE > Class 12 > Physics

5 answers

Devyani Malvi 5 years, 10 months ago

May be come so, solve them also. So that you can achieve more

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Riya Rana 5 years, 10 months ago

Yes definitely

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Riya Rana 5 years, 10 months ago

Defo..

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Priyanka Dube 5 years, 10 months ago

But if by chance any question came you will get full marks just for attempting the question

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Priyanka Dube 5 years, 10 months ago

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Is auora boralis in board syllabus physics cbse

Posted by Adavya Kayasth 5 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Ritwik Choudhary 5 years, 10 months ago

Nope!

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Devyani Malvi 5 years, 10 months ago

?????

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Devyani Malvi 5 years, 10 months ago

What is this

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Explain about gauss law

Posted by Srishty Sidana 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Riya Rana 5 years, 10 months ago

Gauss law states that the net magnetic flux inside a closed surface will always remain ZERO because the magnets always exist as dipole.

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Propety of conservation of charge

Posted by Srishty Sidana 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why zener diod revers biased

Posted by Rakesh Ramotra 5 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Devyani Malvi 5 years, 10 months ago

As it is used as voltage regulator in reverse bias

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Abdeali Najmi 5 years, 10 months ago

When a Zener diode is reverse biased, the depletion layer becomes wider. If this reverse biased voltage across the diode is increased continually, the depletion layer becomes more and more wider.

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Explain briefly how Rutherford's scattering of alpha particle by a target nucleus van provide information of the size of the nucleus.

Posted by Janhvi Singh 5 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 5 years, 10 months ago

In Rutherford famous gold foil experiment most of the α-particle pass through the foil undeflected signifying most of the space inside the atom should be empty, and many of them get deflected by a very small angle implying that the nature of the charge inside the atom (nucleus) that is located at the centre of the atom should be the same as the α-particles i.e. positive. Out of 10000 α-particle, one of them gets deflected for almost 1800 that means the particles retraces its path telling something very dense is situated at the centre of the atom.

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In what perportion theory, derivations and numericals are devided.

Posted by Shubham Makar 5 years, 10 months ago

CBSE > Class 12 > Physics