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

ncert questions and examples are very much necessary for practice . In exam questions may not come exactly as NCERT book but the question are very much similar to NCERT books questions.

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Nishu Sahu 6 years, 5 months ago

Yes, it's too important. It's not necessary that same que come but similar to ncert que come in board.

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Is ray optics in syallabus? Is coaching necesary for pcmb

Posted by Adwitha Nair???‍??‍? 6 years, 5 months ago

CBSE > Class 12 > Physics

7 answers

Priya Dharshini ? 6 years, 5 months ago

I try to give most of the answers i know....kumar...

1Thank You

Zaid Mustafa 6 years, 5 months ago

Obviously it is in the syllabus

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Mandavi Tripathi 6 years, 5 months ago

No there is no need of coaching if u manage all four of these subjects but sometimes it is necessary to do Coach ing

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Mandavi Tripathi 6 years, 5 months ago

Yes ray optics is in syllabus of class 12

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Kumar Vishal Behera 6 years, 5 months ago

Coaching like FIITJEE,allen etc may not be good you may go to group tuitions with less children.

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Kumar Vishal Behera 6 years, 5 months ago

Priya you are really a great you answer every questions.

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Priya Dharshini ? 6 years, 5 months ago

Ray optics is there in syallabus, if u can manage neet with self study good... other wise u need to go to coaching... take help of ur school teachers. If u took pcmb u may write jee as well as neet right..... u can make neet as ur main target... refer books ask doubts in apps. According to me 12th is crucial year make sure not to risk. If u r unable to cope up definitely go to coaching class

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How many chapters has been completed in your school ??????????

Posted by Anushka Sen?? 6 years, 5 months ago

CBSE > Class 12 > Physics

6 answers

Adwitha Nair???‍??‍? 6 years, 5 months ago

Maths ch 1,3 And 12 chemistry ch 2 physics ch 1 bio ch 3,5

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Mandavi Tripathi 6 years, 5 months ago

In physics ch-1 is completed and in chemistry ch-1 and in bio ch-2 is complete d

1Thank You

Kumar Vishal Behera 6 years, 5 months ago

Phy- ch1and 2 Che- ch,2,3,4 Maths-ch-1,3

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Priya Dharshini ? 6 years, 5 months ago

In physics chapter 1,chemistry ch2 and 9,maths chapter5....

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Aman Kumar 6 years, 5 months ago

Electric current also...completed...not remember the chapter no..

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Hemant Yadav 6 years, 5 months ago

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4 particle each having charge q are placed on 4 corner a,b,c,d of regular pentagon abcde the distance of each corner from the center is a find the electric field at the centre of pentagon

Posted by Manoj Yadav 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Aditya Dwivedi 6 years, 5 months ago

manoj 'make a diagram then the distance given a,b,c,d are denoted at each corner .using electric field formula solve out for each corner , then sum all of all corner electric field. then your problem has solved , if you have any problem comment on it

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Why the online test is not working properly???

Posted by Amol Gùpta 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

consider the charges q,q and -q placed at the vertices of an equilateral triangle what is the force acting on each charge

Posted by Dhriti Nayar 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Aditya Dwivedi 6 years, 5 months ago

this is the condition of superposition . using this concept solve it , this is soooo simple

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Is coaching is necessary for pcm class 12?

Posted by Mohitkumar Malik 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Hritik Kumar 6 years, 5 months ago

Self study is the best

1Thank You

Priya Dharshini ? 6 years, 5 months ago

If u r going to give jee... u need to. It is my personal opinion. If ur school teachers are nice and helpful to solve doubts if both boards and jee it is good then no need coaching classes... infact according to me school is waste if time and money. They would not solve ur doubts in class and give u special attention. In coaching classes where munimum 10 students are there teacher can concentrate on each and every child and solve their doubts...

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Shatayu Ganvir 6 years, 5 months ago

Coaching is waste of time and money

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A steel rod of length 1 m and radius 10 mm is stretched by 100 KN force then find stress and strain

Posted by Ekta Soni 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Does the motion of a body affect its charge? Explain....plzzz??

Posted by Zee Saleem ?✌️ 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Hritik Kumar 6 years, 5 months ago

Charge can come only by mass when the body moves the mass change not chage the charge charge is the constant

1Thank You

Anuradha Chaudhary 6 years, 5 months ago

Noo . Motion of body effect mass not charge M=M°/√1-v2/c2

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Yogita Ingle 6 years, 5 months ago

No, charge on a body does not change with motion of the body. The motion of a body is independent of the charge acquired by a body .

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What is quantisation rule

Posted by Sonia Debnath 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Isha Raj 6 years, 5 months ago

Q=ne ...

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Hritik Kumar 6 years, 5 months ago

Q n

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Derive an expression for the electric potential at a point along axial line of a dipole,mention a contrasting feature of electric potential of a dipole at a point as compared to due to a single charge.

Posted by Rohit Kumar 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

One condition when electric field is 0 but potential does exist..

Posted by Ritik Chauhan 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Akanksha Jaiswal 6 years, 5 months ago

Electric feild at the centre of ring is zero bt potential difference cannot zero

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Parallel plate capicitor in dielectric medium

Posted by Nikhil Rathore 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A current of 2 million pear is passed through a colour coded carbon resistor with 1st 2nd and 3rd ring of yellow green and orange color what is the voltage drop across resistor

Posted by Tanu Suman 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Vidushi Shukla 6 years, 5 months ago

According to the color code, yellow=4, green=5 and orange=3. So resistance of carbon resistor = 45 * 10^3. Current = 2 * 10^ (-3) A. Voltage drop = 45* 10^3 * 2*10^ (-3) => Voltage drop = 90V.

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I have physical education in class 11 can i change in class 12 as computer

Posted by Sandeep Shekhawat 6 years, 5 months ago

CBSE > Class 12 > Physics

5 answers

@@Ditya ®°@Thore????? 6 years, 5 months ago

No way ot can change in rbse school

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Uday Mann 6 years, 5 months ago

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Priya Dharshini ? 6 years, 5 months ago

Yes u can change... if u can manage python or c++ this year.... once verify with ur principal regarding this...

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Akarsh Gupta 6 years, 5 months ago

Yess...my many friends changed their subject from computer to physical education in the starting of class 12th

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Arpit Deewal 6 years, 5 months ago

Yes u can but you have to request your principle to do so..

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Two resistance R1 is equal to 100 - + 1 ohms and R2 is equal to 2 + - 21 are connected in series then their equivalent resistance with error is upto appropriated significant figure

Posted by Kaushalkishor Kushwah 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Sl.Arora Physics ka each nd every question solve karna hota hai???? Plz answer..

Posted by Mrutyunjay Khatua 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Priya Dharshini ? 6 years, 5 months ago

Ya... do problems for practice and solved example as soon as u complete 1 chapter...

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ANSWER

Why neutron not get charged whereas proton have near to neutron

Posted by Raushan Kumar Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

a coin is made up of aluminum and weight 0.75g .it has a square shape and its diagonal measures 17mm it is electrically neutral and contain equal amount of positive and negative charge the magnitude of these charges (atomic mass aluminum =26.98)

Posted by Sadique Ahmad 6 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Plz post new pattern of cbse.. Physics..

Posted by Universal Coaching 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Manika Gupta 6 years, 5 months ago

As per new pattern now there will be 37 questions in physics xam out of which first 20 are 1 markers and rest cover the left 50 marks....

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What is the best way to study physics in order to score 65+ marks?

Posted by Nishita Kumari 6 years, 5 months ago

CBSE > Class 12 > Physics

4 answers

Manika Gupta 6 years, 5 months ago

If u want to study good in physics u must have to work hard in physics along with hard workingpractice all the examples and exercise numericals and learn the concept....go through ncert theory very well since there will be 1 markers of 20 marks......along with all this practice different questions from the that u have pteferred loke pradeep and sl arora.......

2Thank You

Amit Kumarsingh 6 years, 5 months ago

If you want to score 100 percent in physics you give minimum 2 hours daily to physics........To achieve this read ncert theory carefully......solve ncert examples and exercises.....and also solve questions from sl arora.....You can chose sl arora or physics all in one arihant publication latest edition 2019-2020. As syllabus is updated and 20 marks mcqs will be there please read theory carefully and learn the derivations.

2Thank You

Priya Dharshini ? 6 years, 5 months ago

Physics is one of the tough subject for me.... i can say practice ncert exercise and solved examples.... do sl arora. Practice last 10 yrs sample paper. Understand physics dont try to mug up... it will be difficult. Of course u need to mug up derivation but understand it....

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Universal Coaching 6 years, 5 months ago

Study hard..

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What is the wavelength of red?

Posted by Sorokhaibam Kumar 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 5 months ago

Wavelength can be defined as the distance between two successive crests or troughs of a wave. It is measured in the direction of the wave.
Wavelength of light varies with colours, i.e., it is different for every colour. Red colour has the longest wavelength while violet has the least. The wavelength of UV radiation is shorter than violet light. Similarly, the wavelength of infra red radiation is longer than the wavelength of red light

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Coaching vs school vs mobile study......which is best option????ANSWER????

Posted by Amit Kumarsingh 6 years, 5 months ago

CBSE > Class 12 > Physics

4 answers

Mohitkumar Malik 6 years, 5 months ago

Bhai self study is better than any options

1Thank You

Dipanshu Kumar Singh 6 years, 5 months ago

I think school and coaching are interrelated. In school you can get easily prepare for board exam and in coaching you can prepare for any competition exam

1Thank You

Priya Dharshini ? 6 years, 5 months ago

Accirding to me coaching is good if u want to achieve ur dreams... if u can do self study u can definitely do that... in school it is of course a waste of time when u only understand 2 or 3 subjects by certain teachers and rest u dont understand... if u understand all teachers teaching in ur school ur lucky... mobile is something which i am against. If u have doubts u can use it... for a reference. When mobile is in ur hand u try to always check ur social media.... concentration wont be in study.. it is my opinion if u can control it v.good then.. all the best, choose best option...

1Thank You

Ravi Yadav 6 years, 5 months ago

Its depending on you in which way you want to study and you feel better. I think these are inter related with each other.If you have any problem in study then you have to take help from mobile also.

2Thank You

ANSWER

Why in equipotenial surface has zero work done???

Posted by Hardeep Singh 6 years, 5 months ago

CBSE > Class 12 > Physics

4 answers

Pragati Gola 6 years, 5 months ago

Net V is 0,W=QV=0

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Yogita Ingle 6 years, 5 months ago

If, a positive test charge q is moved from point A to B, then,
V_B - V_A = W_AB /q
Where W_AB = is work done to move charge q from A to B.
Since, two points A and B are on the same equipotential surface,
V_B- V_A = 0
ThereforeW_AB = 0

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Ayush Verma 6 years, 5 months ago

Becoz equipotential surface has same potential at all point. Therefore, potential difference is zero at all point that's why workdone is also zero. As W=dV/Q

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Shivangi Vats 6 years, 5 months ago

I thnk agr kisi surface pr energy same h to vaha wrk done zero hota h

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