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

Potentiometer. Potentiometer is a device used to compare the e.m.f. (electromotive force) of two cells, to measure the internal resistance of a cell, and potential difference across a resistor.

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Yash Sharma 6 years ago

It is an appartus which is used to measure the potential difference between two points in an electrical circuit accurately..

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Rahul Tiwari 6 years ago

It is a device used to measure potential difference across the terminals

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Sushil Phijam 6 years ago

Khngde!

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Si unit of polarisation

Posted by Kabbu Nauhwar 6 years ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 6 years ago

Polarizabilities determine the dynamical response of a bound system to <a id="S.I.-unit-and-dimensions-of-polarisability" name="S.I.-unit-and-dimensions-of-polarisability"></a>external fields, and provide insight into a molecule's internal structure. In a solid, polarizability is defined as the dipole moment per unit volume of the crystal cell

where 'a' is known as Atomic Polarisability

S.I. unit and dimensions of polarisability

The S.I. unit of polarisability is m³ and it’s dimensions as same as it’s volume.

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Rahul Tiwari 6 years ago

No unit

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Most important question in unit 1

Posted by Parteek Punia 6 years ago

CBSE > Class 12 > Physics

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How current element is a vector quantity and what is the direction?

Posted by Swati Chaurasia 6 years ago

CBSE > Class 12 > Physics

1 answers

Rahul Tiwari 6 years ago

Perpendicular to the plane consisting current and displacement

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The third overtone produced by a vibrating string 0.5 m long is1200Hz the speed of propagation of wave in m/s is

Posted by Shaik Mohammed Wajid 6 years ago

CBSE > Class 12 > Physics

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Two point charge of +5×10 power -19columb and +20×10power 19columb are seperated by a distance 2metre . Find intensity is zero

Posted by Rabina Gurung 6 years ago

CBSE > Class 12 > Physics

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Derive mirror equation for a convex mirror

Posted by Pushkar Singh 6 years ago

CBSE > Class 12 > Physics

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Parallel plate capacitor and its capacitance

Posted by Shlok Bidua 6 years ago

CBSE > Class 12 > Physics

1 answers

Rahul Tiwari 6 years ago

capacitance - A€/D parallel plate capacitor are those capacitor which are parallel

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Explain using a suitable diagram how unpolarised light gets linearly polarised by scattering

Posted by Rashmi Gusain 6 years ago

CBSE > Class 12 > Physics

2 answers

Theperfectmukul Roy 6 years ago

For more information contact to [email protected]

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Theperfectmukul Roy 6 years ago

When unpolarized light strike a pàrticle having comparable size and wave and the wave length of light then it get scattered and the components of scattered of light in the perpendicular directions of incident light get plane/linearly polarized.

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Is derivation of transformer coming in cbse syllabus??????

Posted by Chetna Bhatt 6 years ago

CBSE > Class 12 > Physics

3 answers

Kaptan Singh 6 years ago

It's there in our syllabus.

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Md Akib Ansari 6 years ago

Really derivation of transformer is not comes in cbse exams?

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Md Akib Ansari 6 years ago

I think it, doesn't matter that derivation of transformer comes or not in cbse exams, but it matters that all topics are essential for us?❣?

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Preboard ke liye sample paper

Posted by Ujjwal Singh 6 years ago

CBSE > Class 12 > Physics

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Plz tell me ch semiconductor me kya kya padhna hai for board exams ke liye

Posted by Amir Khan 6 years ago

CBSE > Class 12 > Physics

1 answers

Md Akib Ansari 6 years ago

Rectifier tk padna hai

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A charge q is placed at the centre of open end of a cylindrical vessel. Electric flux through the surface of the vessel

Posted by Ritik Meena 6 years ago

CBSE > Class 12 > Physics

1 answers

Rahul Tiwari 6 years ago

Eds cos

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A wire of resistance 8R is bent in the form of a circle. What is the effective resistance between the ends of the diameter AB.

Posted by Deepak Silaych 6 years ago

CBSE > Class 12 > Physics

1 answers

Md Akib Ansari 6 years ago

1/4+1/4=1/R 2/4=1/R 1/2=1/R R=2

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Represent graphically the variation of electric field with distance, for a uniformly charged plane sheet.

Posted by Rp Guru 6 years ago

CBSE > Class 12 > Physics

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What percentage of the incident light is transmitted if the angle between polariser and analyser is 30 degree

Posted by Karthik Singh 6 years ago

CBSE > Class 12 > Physics

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Wet what is the minimum possible charge

Posted by Manish Mewada 6 years ago

CBSE > Class 12 > Physics

1 answers

Yuvraj Singh 6 years ago

Charge on electron , e= 1.6 × 10^-19 C

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My doubt regards ncert page 8 Topic -charge is conserver. Second para. Can anyone clear my doubts. ?

Posted by Mukul Rao 6 years ago

CBSE > Class 12 > Physics

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which chapters are important for numericals to gain good marks

Posted by Jagtar Singh 6 years ago

CBSE > Class 12 > Physics

3 answers

Aman Kumar 6 years ago

1,23and9,10

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Muskan Dagar 6 years ago

Capacitance nd atoms nd nuclei

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Harshit Malik 6 years ago

Chapter 1,2

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Derive the expression for drift velocity of free electron in terms of relaxation time and electric field applied across a conductor.

Posted by Neha Roy 6 years ago

CBSE > Class 12 > Physics

1 answers

Yuvraj Singh 6 years ago

You can check in NCERT book

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Difference between momentum and impulse

Posted by Dinesh Pandey 6 years ago

CBSE > Class 12 > Physics

2 answers

Saumya Shri 6 years ago

IMPULSE is known as change in momentum. MOMENTUM is product of mass and velocity

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Jay Mahiwal 6 years ago

IMPULSE is the product of force applied to an object and the time for the application. MOMENTUM is the product of mass and velocity of a particle.

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What is lifi

Posted by Akshat Shakespeare 6 years ago

CBSE > Class 12 > Physics

2 answers

Jai Kishan Choudhary 6 years ago

Lifi is a new concept which is used to transfer data in our smart phones through LED bulb. It is faster than hifi. It doesnt harm our nature. But its work under a range . it

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Dhiraj Singh 6 years ago

Similar to wifi it is a source of internet connectivity spread as light spread in a area intensity max at source point

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