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

If a force acting on a particle is always directed towards or away from a fixed point and its magnitude depends only upon the distance (r) from the point , then the force is "Central Force".

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Mahima Pattanayak 5 years ago

Central force is the force that is radially pointing and the magnitude is dependent on the distance from the source. Examples of central forces are gravitational force, electrostatic forces, and spring force.

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ANSWER

Which guide is effective for class 12

Posted by Vedha ..... 5 years ago

CBSE > Class 12 > Physics

4 answers

Student Of The Year 5 years ago

Anyone, if you go with NCERT it would best.

0Thank You

Akshara Dadheech 5 years ago

Best book for practice is-oswal and xamidea... While for theory..sl arora is best

1Thank You

Gaurav Bagga 5 years ago

Teacher always prefer examidea dude Choice is yours

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Vivek Chaurasia 5 years ago

Sl arora

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ANSWER

Yrr mere se numericals nhi ho paa rhe h m kya kru....mera numerical value bhut weak h....??☹️☹️

Posted by Nisha Yadav 5 years ago

CBSE > Class 12 > Physics

4 answers

Akshara Dadheech 5 years ago

Theory padh lo pehle ache se... Fir bad m easy numericals se shuru kro

2Thank You

Student Of The Year 5 years ago

NCERT ke examples banaiye

3Thank You

Anuj Singh 5 years ago

THEORY PADH KE JAO... AUR SOLVE HO RAHA HA TO THIK HA NHI TO FORMULA YAAD KR LO

2Thank You

Vivek Chaurasia 5 years ago

Starting kro kuch easy question sa uska solution ka saath... Or board ma bhut tough nii aata ha revise kro ho jaayega

3Thank You

ANSWER

Resistance of inductor coil least count of D.C. voltmeter =

Posted by Gourav Soni 5 years ago

CBSE > Class 12 > Physics

1 answers

Priyanshu Shukla 5 years ago

Range

1Thank You

ANSWER

There is any change in the syllabus of 2021-22 or the syllabus is same ?please answer my question.

Posted by Priyanka Rajawat 5 years ago

CBSE > Class 12 > Physics

3 answers

Anuj Singh 5 years ago

PADH LIKH KE KON RAJA BANA HA??????

0Thank You

Deepak Yadav 5 years ago

No update till bro

0Thank You

Vivek Chaurasia 5 years ago

You can check latest syllabus

5Thank You

ANSWER

State n prove Gauss theorem

Posted by Smita Gupta 5 years ago

CBSE > Class 12 > Physics

2 answers

Shreya Singh 5 years ago

Gauss’s Theorem Statement: According to Gauss’s theorem the net-outward normal electric flux through any closed surface of any shape is equivalent to 1/ε0 times the total amount of charge contained within that surface. Proof of Gauss’s Theorem Statement: Let the charge be = q Let us construct the Gaussian sphere of radius = r Now, Consider , A surface or area ds having having ds (vector) Normal having the flux at ds: Flux at ds: d e = E (vector) d s (vector) cos θ But , θ = 0 Therefore, Total flux: C = f d Φ E 4 π r2 Therefore, σ = 1 / 4πɛo q / r2 × 4π r2 σ = q / ɛo

2Thank You

Abhay Pratap 5 years ago

that's enough simple

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ANSWER

Want to make new friends when they are free .

Posted by Shyam Singh 5 years ago

CBSE > Class 12 > Physics

5 answers

Sanu ? 5 years ago

2Thank You

Sanu ? 5 years ago

Mai chalata nhi hu telegtam or whatsapp

2Thank You

Shyam Singh 5 years ago

Free time bola hai bro

2Thank You

Shyam Singh 5 years ago

Reply as your no. To chat on telegram/whatsapp thnx

1Thank You

Sanu ? 5 years ago

Padh lo pehle ??

2Thank You

ANSWER

Which book is best xam idea or arihant ncert solutions class 12 for physics ?

Posted by Mahima Pattanayak 5 years ago

CBSE > Class 12 > Physics

4 answers

Shyam Singh 5 years ago

That was better which makes you comfort

0Thank You

Vivek Chaurasia 5 years ago

Xam idea and sample paper dono ko carry kro jada benifit milaga aapko?...

3Thank You

Tanya ?? 5 years ago

Ya....I also have xam idea!!!

5Thank You

Sunidhi Taya 5 years ago

Xamidea

2Thank You

ANSWER

How many of you is on revision mode

Posted by Nitesh Kumar 5 years ago

CBSE > Class 12 > Physics

2 answers

Nitesh Kumar 5 years ago

How you completed your syllabus? Are you completed your syllabus with PYQ?

2Thank You

Balraj Dhakad 5 years ago

Meeeeee

6Thank You

ANSWER

Is it necessary to read NCERT line by line with notes??

Posted by Nitesh Kumar 5 years ago

CBSE > Class 12 > Physics

5 answers

Student Of The Year 5 years ago

No,, you don't need to read ncert line by line. Notes are sufficient to get about 80% marks in board.

1Thank You

Balraj Dhakad 5 years ago

Yes it's Necessary but not Compulsory

1Thank You

Nitesh Kumar 5 years ago

Reply plz

0Thank You

Nitesh Kumar 5 years ago

And for physics

0Thank You

Ayansh Raj 5 years ago

Yes, especially chemistry

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ANSWER

Electric field at any ponit due to charge

Posted by Smita Gupta 5 years ago

CBSE > Class 12 > Physics

1 answers

Ayush Vishwakarma 5 years ago

Kq/r^2

3Thank You

ANSWER

How to find electrostatic potential and work done??

Posted by Nitesh Kumar 5 years ago

CBSE > Class 12 > Physics

1 answers

Tarun Kumar 5 years ago

Take a charge at infinity and find potential to work done in moving charge from infinity to a charge

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ANSWER

Two identical parallel plate capacitor a and b e are connected to a battery e of v volts with the switch s closed the switch is now opened and the free space between the plates of the capacitors is filled with a a dielectric of dielectric constant k find the ratio of the total electrostatic energy stored in both capacitor before and after the introduction of the dielectric.

Posted by Khushi Bishnoi 5 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Charging by friction

Posted by Anshika Chaudhary 5 years ago

CBSE > Class 12 > Physics

1 answers

P....... ........ 5 years ago

Charging by friction: the transfer of electrons from one uncharged object to. another by rubbing the two objects together. Some electrons can move to the. other object when rubbing (hair and balloon)

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ANSWER

8.85×10-12×π×[5×10-2]×10°12

Posted by Fuleshwar Sahu 5 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to draw frequency of A.C.mains by sonometer

Posted by Shumugthaa Shanmugam 5 years ago

CBSE > Class 12 > Physics

1 answers

P....... ........ 5 years ago

Move wooden bridges P, P outward to include maximum length of wire (AB) between them. Decrease the length of the wire by moving both the bridges equally inwardly. Go on decreasing the length till sonometer wire starts vibrating (a sound is heard). Adjust the length for maximum amplitude of vibration, (maximum sound).

1Thank You

ANSWER

Thermionic Emission ?

Posted by P....... ........ 5 years ago

CBSE > Class 12 > Physics

1 answers

Nidhi Bharti 5 years ago

Ejection of ejectrons of a metal surface from their valence shells by applying heat/temperature

3Thank You

ANSWER

When will cbse launch 2021- 2022 syllabus

Posted by Sumit Kumar 5 years ago

CBSE > Class 12 > Physics

3 answers

Sumit Kumar 5 years ago

Rahul bhai mai 12th me abhi hi aya hun to jeetna jyada time milega utna achhe se cover kr paunga

0Thank You

Balraj Dhakad 5 years ago

Sooooonnnnnn

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Rahul Yadav 5 years ago

2021 walo ko exam dene de bhai?

0Thank You

ANSWER

When will cbse launch 2020-2021 syllabus

Posted by Sumit Kumar 5 years ago

CBSE > Class 12 > Physics

2 answers

Tanya ?? 5 years ago

Hamare kl se start h vivek...kl.first h???

0Thank You

Sumit Kumar 5 years ago

Sorry 2021-2022 syllabus

0Thank You

ANSWER

Physics k theory section ko kaise complete kru

Posted by Diti Urvija 5 years ago

CBSE > Class 12 > Physics

5 answers

Mukul Singh 5 years ago

One shots lecture le lo vedantu se phirr jb chapter ka over view ho jaye tb ncert padh lo important questions dekh lo jo topic samjh me na aaye uske lectures le lo ya phir kisi teacher se puch lo or last me time bache to derivation or formulas dekh lo

0Thank You

Vivek Chaurasia 5 years ago

Abhi tho start hii nhi hua ha ??? or apkaa...

0Thank You

Tanya ?? 5 years ago

Diti and vivek practical ho gye apke....

1Thank You

Vivek Chaurasia 5 years ago

Theory section ko bhut hi achha sa padho or derivation ko bhi.. qki MCQS jo aata ha vo theory pr base hota ha or derivation vii esi sa tumara number inrease karega.. ??? Koi side book sa pdho jasa sl arora.. Ya tho aman bhiya ha note download kr lo apni kaksha sa.. Jada ho gya abb?????

1Thank You

Levin Yadav 5 years ago

Padhke....

0Thank You

ANSWER

State the postulates of bohr's theory of hydrogen atom

Posted by Arsh Nagra 5 years ago

CBSE > Class 12 > Physics

2 answers

Nidhi Bharti 5 years ago

1. The electron revolves in orbits of fix energy and they never emits radiations while revolving in them. 2. The electron will revolve in the orbit for which it's angular momentum is integral multiple of h/2π 3. Electron will absorb energy if it makes transition to upper energy level and will emit radiations if it makes transition to lower energy orbit. The energy evolved or absorbed is equals to the energy gap to two orbits involved in transition. 4. The rotating electron always have a fix energy and which is equals to the energy of the orbit in which it is rotating.

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Mohit Sehwag 5 years ago

It's so easy man

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ANSWER

Electric charge is scalar or vector

Posted by Chirag Mahajan 5 years ago

CBSE > Class 12 > Physics