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

Dielectric is an insulator which can be polarized through small localised displacement of its charges...or.it can be defined as a substance which does not allow flow of charges through it but permits them exert electrostatic force on one another through it.

2Thank You

Riya Rana 6 years ago

It is an insulator that conducts electricity.

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ANSWER

Wht is wave front

Posted by Suraj Bhatt 6 years ago

CBSE > Class 12 > Physics

4 answers

Shefu ??????? 6 years ago

Continuous locus of all particles vibrating in same plane

0Thank You

Uday Mann 6 years ago

Locus of all the particles vibrating in same phase .

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Aditya Vinay 6 years ago

observing your blu ballz explode up cloze lmao.....

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Riya Rana 6 years ago

A continuous locus of vibrating particles present in the same phase.

2Thank You

ANSWER

What are the observations made from the expression of de broglie wavelength

Posted by Chandani Ranpura 6 years ago

CBSE > Class 12 > Physics

1 answers

Nikita Beniwal 6 years ago

Matter has both particle and wave nature

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ANSWER

How will the magnetic field intensity at the centre of the circular coil carrying current will change if the current through the coil is double and the radius of the call is half?

Posted by Nilesh Hiragar 6 years ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years ago

The magnetic field at center of a coil, B ∝ I/R when current I is doubled and radius R is halved, the magnetic field becomes four times the original field.Read more on Sarthaks.com - https://www.sarthaks.com/174321/how-will-the-magnetic-field-intensity-at-the-centre-circular-coil-carrying-current-change

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ANSWER

Two point charges q1 q2 initially at infinity are brought one by one to points p1 and p2 specified by position vector r1 and r2 relative to some origin what is the potential energy of this charge configuration

Posted by Shikha Kumari 6 years ago

CBSE > Class 12 > Physics

2 answers

Shefu ??????? 6 years ago

Kp1/r1 +Kp2/r2

0Thank You

Aditya Gupta 6 years ago

Google it you idiot

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ANSWER

Anyone whos preparation is completed???

Posted by Killer Xmarty 6 years ago

CBSE > Class 12 > Physics

8 answers

Uday Mann 6 years ago

Done

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Deepak Singh 6 years ago

????

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Killer Xmarty 6 years ago

???????

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Shatayu Ganvir 6 years ago

Nopeeeeee I want to die

0Thank You

Killer Xmarty 6 years ago

Ooh... Bdi jldi hai

0Thank You

Tamanna Sharma 6 years ago

I am ready for the exams,,,let's rock it

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Prateek Mishra 6 years ago

Nooo.???

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Tapan Pandey?? 6 years ago

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ANSWER

Is reflecting type telecope(cassegrainian ?) in our syllabus?

Posted by Muskaan Vig 6 years ago

CBSE > Class 12 > Physics

3 answers

Killer Xmarty 6 years ago

Yup

1Thank You

Riya Rana 6 years ago

Yeaapp!!

1Thank You

Jagjeet Singh 6 years ago

Yes

1Thank You

ANSWER

what is the source of uv ray

Posted by Rohit Kumar 6 years ago

CBSE > Class 12 > Physics

4 answers

Riya Rana 6 years ago

Welding.

0Thank You

Deepak Nayak 6 years ago

Lyman seris of atoms

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Vinay Gautam 6 years ago

Sun

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Muskaan Vig 6 years ago

Sun,UV lamps etc.

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ANSWER

A carrier wave of frequency FC is amplitude modulated by an audio wave of frequency FM. The band witch of the modulated wave will be

Posted by Gaurav Kumar 6 years ago

CBSE > Class 12 > Physics

1 answers

Vaishnavi Kalvakuntla 6 years ago

Out of syllabus

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ANSWER

Define 1ampere current??

Posted by Arnav Kandari 6 years ago

CBSE > Class 12 > Physics

6 answers

Arnav Kandari 6 years ago

Bas ??

0Thank You

Rahul Sharma 6 years ago

f/l = μ/4pi * 2ＩＩ’ / d

1Thank You

Navneet . 6 years ago

???? glti se idher udher nikl gya Kya?

0Thank You

Rajat Barwar 6 years ago

When 1 coulomb charge pass through a wire in 1 sec,it constitutes 1 amp. current.. Hope this may help u...

2Thank You

Arnav Kandari 6 years ago

Abe saale

2Thank You

Shivam Mishra 6 years ago

What is doping

1Thank You

ANSWER

rate decay of a rxn falls from 4/1000000 to1/1000000 in20 mint find rate decay after 100 mint also find half life time of the rxn

Posted by Sanjay Kumar 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Relation btw lcr and cr circuti

Posted by Priyanshu Gautam 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Work function of Sofium

Posted by Himanshu Gautam 6 years ago

CBSE > Class 12 > Physics

2 answers

Rajat Barwar 6 years ago

It is 2.3 eV.

1Thank You

Rajat Barwar 6 years ago

It is given in ncert chap. 11.

1Thank You

ANSWER

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beaem 12cm from P. At what point does the beam converge if the lens is (i)a convex-lens of focal length 20 cm (ii) a concave lens of focal length 16 cm

Posted by Sohan .G 6 years ago

CBSE > Class 12 > Physics

1 answers

Shefu ??????? 6 years ago

i) 7.5cm ii)-48 cm

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ANSWER

Electromagnet wave used in leakage in underground pipeline

Posted by Abhishek Rai 6 years ago

CBSE > Class 12 > Physics

2 answers

Abhishek Rai 5 years, 11 months ago

Thanks

0Thank You

Muskaan Vig 6 years ago

Lambda 3 em wave..

1Thank You

ANSWER

Experience for capastence of parallel plate capacity with 1.dielectric slab between the plate 2. Conducting slab between the plate

Posted by Lavleshrai Ashu 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Using Bohr Postulate for hydrogen atom show that total energy of electron in stationary state can express as sum of potential and kinetic energy where kinetic energy is -2U ,U is potential energy

Posted by Nikita Beniwal 6 years ago

CBSE > Class 12 > Physics

1 answers

Manjay Jha 6 years ago

The derivation is itself given in ncert!

1Thank You

ANSWER

What r possible cause for one side deflection in potentiometer

Posted by Nikita Beniwal 6 years ago

CBSE > Class 12 > Physics

2 answers

Nikita Beniwal 6 years ago

How

0Thank You

Yogita Ingle 6 years ago

When the driver cell / source cell has an emf less than the emf of the cells to be compared.
When the positive end of the potentiometer wire is connected to negative terminal of the cell whose emf is to compared / determined.

1Thank You

ANSWER

What is real and apparent depth define

Posted by Syed Ahmad Raza 6 years ago

CBSE > Class 12 > Physics

1 answers

Gaurav Tiwari 6 years ago

real depth and apparently depths

4Thank You

ANSWER

Sir i want to kñów abóut the qúestioñs thats come in 5 añd 3 marks from all the çhaptérs

Posted by Suresh Panwar 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Sir i need most expected question of all chapters Plz help sir

Posted by Naman Singh 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A photosensitive surface emits photoelectrons whrn red light fals on it will the surface emit photoeltrone when blue light is incident on it give reasons

Posted by Prachi Tomar 6 years ago

CBSE > Class 12 > Physics

2 answers

Anonymous Man 6 years ago

Because frequency of red light is not sufficient to emitt an electrom from that surface whereas blue light has higher frequency then red light

0Thank You

Aman Saurav 6 years ago

As photoelectrons are ejected, so the frequency of red light is greater than the threshold frequecny . Now as the frequency of bue light is more than tha frequency of red light, so photoelectrons can be easily ejected. Hope you understand.

1Thank You

ANSWER

Imp derivations for physics exam

Posted by Happy Sharma 6 years ago

CBSE > Class 12 > Physics

2 answers

Abhishek Rai 6 years ago

Lens maker formula fix hai aana

0Thank You

Prachi Tomar 6 years ago

A photosensitive surface emits photoeletrons when redlight falls on it will the surface emit photoeletrone when blue ligjt is incident on it give reasion

6Thank You

ANSWER

Derive an expression for the electric field intensity at a point on the equatorial plane of an electric dipole moment p and length 2l. What is the direction of this field

Posted by Mithai Mhal 6 years ago

CBSE > Class 12 > Physics