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

Quantization of charge:-It states that the total charge of a system is always an integral multiple of the quantum charge on an electron. i.E- Q=+/-(ne) ,where 'n' is any integer.

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Rahul Yadav 6 years ago

Acc. to quantisation of charge the charge will always be some integral multiple of constant quantity .It's formula is q=+-ne

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Will there be any change in syllabus for physics & chemistry for 2o21 board exams?

Posted by Sanjeev Mandle 6 years ago

CBSE > Class 12 > Physics

1 answers

Mahesh M 6 years ago

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The path of a charged particle entering parallel to uniform magnetic field will be circular or helical?

Posted by Sindhu Philip 6 years ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years ago

A charged particle moves in a circle when its velocity is perpendicular to the magnetic field. When it forms an acute angle with the magnetic field, it can be resolved in two components, parallel and perpendicular. The perpendicular components tends to move it in circle, the parallel components tends it to move along the magnetic field to form a helical motion of uniform radius and pitch.

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When will 2020 syllabus will come

Posted by Jatin Verma 6 years ago

CBSE > Class 12 > Physics

1 answers

Mirza Ubaid 6 years ago

Don't worry about syllabus If you want to study then go for important units because it can't be detected like electrostatic , modern physics.

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Express Coulomb law in vector form (I am confused if r12 = r1- r2 or r2 - r1)

Posted by Smile Josan 6 years ago

CBSE > Class 12 > Physics

0 answers

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School kab se start hoga bhai log

Posted by Da Ya 6 years ago

CBSE > Class 12 > Physics

1 answers

Smile Josan 6 years ago

Hmara tou 1 april se

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Coefficient of mutual inductance of two coils is 1H . Current in one of the coils is increased from 4 to 5 A in 1 ms . What average emf will be induced in the other coil

Posted by Fathima Zahdiya 6 years ago

CBSE > Class 12 > Physics

0 answers

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Is physics ncert helpful for boards?

Posted by Smile Josan 6 years ago

CBSE > Class 12 > Physics

1 answers

Pragati Hatinia 6 years ago

Yes. It's very important bcz NCERT book is advised by cbse board. One should not ignore NCERT books especially in board exams

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Was there any question in physics paper which was asked directly from ncert?

Posted by Smile Josan 6 years ago

CBSE > Class 12 > Physics

0 answers

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How to do physics for jee mains?? Tell me anyone

Posted by Akhil Kumar 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How was the physics paper?

Posted by Supriya Tiwari 6 years ago

CBSE > Class 12 > Physics

1 answers

Akhil Kumar 6 years ago

Out of format

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Which reference is best for board exam

Posted by Akash Meher 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Find electric field at a point at a distance r >R for a non conducting solid sphere.

Posted by Sakshi Yadav 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Anyone from bihar board

Posted by Alok Kumar 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

trolley of mass 300 kg carrying a sandbag of 25 kg is moving uniformly with a speed of 27 km/h on a frictionless track. After a while, sand starts leaking out of a hole on the floor of the trolley at the rate of 0.05 kg s -1 . What is the speed of the trolley after the entire sand bag is empty?

Posted by Piyush Raj 6 years ago

CBSE > Class 12 > Physics

0 answers

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Can anybody tell me which is good for cbse boards sl arora book or pradeep

Posted by Rohit Sharma 6 years ago

CBSE > Class 12 > Physics

6 answers

Priya Bungla 6 years ago

S L Arora is best because its language is easy to understand

1Thank You

Shilpa Sharma 6 years ago

Nootan kumar mittal paper better hoga

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Nishant Kapoor213 6 years ago

Na he pradeep na he SL agr feel krni h physics toh Resnick hallidey ki book pdo khud socho imagine kro then cengage kro numerical ke liye. Resnick sirf theory ke liye.

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Abhinav Tomar 6 years ago

In which you can understand easily

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Řøhăň Řąjpůť ✌️✊ 6 years ago

SL arora.. but maine HC verma kari thi vo karo physics ka paper accha jayega. ✌️✌️✌️

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Utkarsh Goel 6 years ago

Pradeep

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Why stars break???

Posted by Reenu Dogra 6 years ago

CBSE > Class 12 > Physics

4 answers

Nishant Kapoor213 6 years ago

Stars explode its right statement then break. If u translate taara tootna in english then its comet tail u see thats not star. They are any celestial body which has tail u think its star break.

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Riya Rana 6 years ago

Those are meteoroids

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Arb Man 6 years ago

Stars doesn't break at all. In space some floating rocks(small meteor or small asteroid) hit with each other . As we are on earth we see that the star breaks. Actually they are rocks, shines because of sun rays on them.

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Arb Man 6 years ago

Because they do break dance.?

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Tell me tips to get S.I unit about 1st chap

Posted by Brajesh Baghel 6 years ago

CBSE > Class 12 > Physics

1 answers

Insha Khalid 6 years ago

Learn definition in easy way

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A piece of wool is rubbed against a PVC strip.what will be the charge on the strip,if approximately 2×10^electrons are transferred from the wool to the PVC strip

Posted by User999999 99 6 years ago

CBSE > Class 12 > Physics

1 answers

Nishant Kapoor213 6 years ago

Charge on strip = e(2×10^10) e= -1.6×10^19C

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Example 1.6 ncert please explain

Posted by Samyuktha??? Suresh Kannan 6 years ago

CBSE > Class 12 > Physics

3 answers

Tamanna Sharma 6 years ago

Sorry maine subject nahi dekha mujhe maths laga

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Tamanna Sharma 6 years ago

1.6 example nahi he direct natural naming he fir bhi app page no. Bata doo

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Udit Sen 6 years ago

Hence, proved

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Why earth have atmosphere?

Posted by Ibad Gazi 6 years ago

CBSE > Class 12 > Physics

6 answers

Insha Khalid 6 years ago

1.for protection from ozone and uv rays from sun. 2.

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Nishant Kapoor213 6 years ago

Escape velocity of gas particles are less on earth as compare to earth gravitational force.

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Riti Bansal 6 years ago

For protection from o3

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Tamanna Sharma 6 years ago

Otherwise lot of fundamental aspect behind that

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Tamanna Sharma 6 years ago

Because the particle ( in atmosphere) present in earth do not have much oscillating energy ( thermal , shm, internal etc.) to overcome gravity and hence stay in earth attraction field and form a atmosphere around us while on the other hand like moon these particle escape out and vacuum is there and no atmosphere....hope you want ans as per from gravity aspect

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Pranav Sharma 6 years ago

For protection

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M1m2 mass connected with the help of mass less string passing over a friction less pulley find acceleration and tension in string

Posted by Milan Tyagi 6 years ago

CBSE > Class 12 > Physics

1 answers

Nishant Kapoor213 6 years ago

M1g/(M1-M2)= a If m1 > m2 then a=+ve otherwise negative. Tension, m2a

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Why earth have electric potential zero

Posted by Shubham Pandey 6 years ago

CBSE > Class 12 > Physics

3 answers

Nishant Kapoor213 6 years ago

First understand why electron potential develop somewhere due to gain or lost of charges region becomes high potential or low. Now earth is very large if u take some charges out from it or add some charges add to this. All charge distributed overall on earth now u think does it change it potential? Obviously no hence we say it has 0 potential

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Tamanna Sharma 6 years ago

Because of its high capacity ( infinite) c= q/v

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Rangat Kaur 6 years ago

The real earth is electrically neutral this means that it has the same number of electrons and protons so their charges cancel out overall

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