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

Electric flux: The number of electric field lines passing over an area is known as electric flux. it is given by formula surface integral of E into dot product of ds

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The capacitance of a capacitor becomes 7/6 times its original value if a dilectric slab of thickness t=2/3d is introduced in between the plates,where d is the separation between the plates.the dilectric constant of the slab is

Posted by Nikita Swami 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to use right hand thumb rule?

Posted by Kaliappan Sk 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Priya Dharshini ? 6 years, 6 months ago

Open ur right hand and point it to the direction of current and curl ur fingers... the ditection ur fingers move... is where magnetic field is present... it can be anti clock wise or clock wise..

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Name the substance whose permeability is slightly less than one.?

Posted by Rahul_ Ry(ʘ‿ʘ) 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Parth Agarwal 6 years, 6 months ago

Bismuth and lead

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Rahul_ Ry(ʘ‿ʘ) 6 years, 6 months ago

Dhanyavad, Priya (x2).....

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Priya Priya 6 years, 6 months ago

Eg: plastic, wood, rubber etc. These are "diamagnetic substances".And the parmeability of diamagnetic substances is less than 1 but not negative

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A student measure the thickness of a human hair by looking at it through .a Microscope of magnification 100. He makes 20 observation and find that the average width of the hair in the field of view of the microscope is 3.5mm.what is the estimate on the thickness of hair?

Posted by Lucky Soni 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

Magnification of the microscope = 100

Average width of the hair in the field of view of the microscope = 3.5 mm

{tex}\therefore{/tex} Actual thickness of the hair is{tex}\frac { 3.5 } { 100 }{/tex} = 0.035 mm.

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Which material has negative temperature coefficient of resistance ?

Posted by Divya Deep Srivastava 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 6 years, 6 months ago

A negative coefficient for a material means that its resistance decreases with an increase in temperature. Semiconductor materials (carbon, silicon, germanium) typically have negative temperature coefficients of resistance.

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Shivam Chaurasia 6 years, 6 months ago

Semiconductors.

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Please give the question pattern of 2019-20 physics

Posted by Arun Babu 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

Check here : https://mycbseguide.com/cbse-syllabus.html

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How to make concept of derivation of Phy

Posted by Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

CBSE > Class 12 > Physics

36 answers

Tanvi Toor 6 years, 6 months ago

Hnji practical

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Practical

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Tanvi Toor 6 years, 6 months ago

Abi to sirf ek hi hua m.... Wheat stone bridge wala....

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

3rd chapter chal raha h How many practicals u r done

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Tanvi Toor 6 years, 6 months ago

5th chal rha h abi... Nd aapka?

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

How many chapters r covered in Phy

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Tanvi Toor 6 years, 6 months ago

Ohk

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Ghazipur sun shine school

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Tanvi Toor 6 years, 6 months ago

Or aap??

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Tanvi Toor 6 years, 6 months ago

Panipat se..... Arya girls public school

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Puch sakhati Ho tum kaha se ho school name

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Tanvi Toor 6 years, 6 months ago

Puch bi nhi skti kya ??

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Tanvi Toor 6 years, 6 months ago

Pucha h...

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Kya Karana h

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Tanvi Toor 6 years, 6 months ago

Ohk....

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Maths student h

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Tanvi Toor 6 years, 6 months ago

Hnji @Rohit

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Maths or bio puch rahi ho

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Tanvi Toor 6 years, 6 months ago

Medical h ya non- medical

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Mtlab

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Tanvi Toor 6 years, 6 months ago

R u a medical or Non-medical student????

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Tanvi Toor 6 years, 6 months ago

Hmmm vo bi h ??

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Practice ke liye batana concept Sahi se clear Karana Yahi suggestions rahi practise ki bat to Apani problem Kitana Kare ya Kitana nahi work on phy

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Tanvi Toor 6 years, 6 months ago

@rohit gupta...... Inn me se suggestion kiska tha...... Muje to pta hi ni chla.... Ye to hme bi pta h ki practice se hoga but prblm hi to vhi h physics ki practice nhi ho pati..... ??

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Tnx to all for your good suggestion

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Amol Gùpta 6 years, 6 months ago

First clear the concept then try to give ur best and do practice

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Rahul_ Ry(ʘ‿ʘ) 6 years, 6 months ago

Samj le pehle phir practice kar ....

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

everyday nd daily same hai. flow flow mein type ho gya.. ? ? ? ?

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Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

For derivation u have to practice it 2 to 3 times daily everyday.

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Same here

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Tanvi Toor 6 years, 6 months ago

Solution pta hota to m bhi physics me weak na hoti.....??

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Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Any solution

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Tanvi Toor 6 years, 6 months ago

Hmm... Shi kha yrr physics=phobia ??

1Thank You

Ɽøⱨł₮ ₲Ʉ₱₮₳ 6 years, 6 months ago

Practice to h but fear is big problem

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Tanvi Toor 6 years, 6 months ago

Practice,practice and practice

2Thank You

Uday Mann 6 years, 6 months ago

Just write it 2 times and u will leran it

1Thank You

ANSWER

What is superposition principle???

Posted by Dàñïyã Ãrshãd? 6 years, 6 months ago

CBSE > Class 12 > Physics

5 answers

Dàñïyã Ãrshãd? 6 years, 6 months ago

Thnku @Aman Pratap

1Thank You

Aman Pratap 6 years, 6 months ago

The net force on a charge can be calculated by the vector addition of all the idividual forces acting on that particular charge.

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Dàñïyã Ãrshãd? 6 years, 6 months ago

Thnkew @Uday Mann @Tanvi Toor

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Tanvi Toor 6 years, 6 months ago

It is the property of forces with which two charges attract or repel each other and are not affected by the presence of a third additional charge....

2Thank You

Uday Mann 6 years, 6 months ago

force on any charge due to a number of other charges is the vector sum of all the forces on that charge due to other charges, taken one at a time.

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Can we use u like for board exams? please give review

Posted by Manav Bansal 6 years, 6 months ago

CBSE > Class 12 > Physics

4 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

bhai meri maan sub acche hai.. bheed ka hisa na baan Jis se tujhe convince ho vo le .. Verna select kerte kerte he December aa jayega.

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Ďãřşháñăã Yadav ? ? ? 6 years, 6 months ago

yes U like is gud. but my teacher suggest us to prefer Arihant becoz Arihant have update version of collections of cbse paper.

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Priya Dharshini ? 6 years, 6 months ago

U like is book ??

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Priya Dharshini ? 6 years, 6 months ago

?? What we can use... i didnt understand..

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For two nichrome wires are connected in series with the battery. How does the ratio of drift velocity of electrons in them depend on their length and diameters.

Posted by Sha Mmi 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Please tell me the link of new ncert book of physics 2019-2020

Posted by Sukhmanderdeep Singh 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Which is the best refrence book for cbse students?

Posted by Manav Bansal 6 years, 6 months ago

CBSE > Class 12 > Physics

10 answers

Sia ? 6 years, 6 months ago

HC Verma or Modern ABC

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? Natasha Yadav? 6 years, 6 months ago

Sl Arora

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

Hc verma or sl arora

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Tanvi Toor 6 years, 6 months ago

SL Arora HC verma ✌

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Manav Bansal 6 years, 6 months ago

What about u like

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Priya Dharshini ? 6 years, 6 months ago

Sl arora for boards and jee- dc pandey..

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Nishu Sahu 6 years, 6 months ago

Sl Arora

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Gursharn Kaur 6 years, 6 months ago

Pradeep and modern

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Amit Yadav 6 years, 6 months ago

Best book is HC verma

1Thank You

Řøhăň Řąjpůť ✌️✊ 6 years, 6 months ago

pradeep nd SL Arora both are gud. ?

1Thank You

ANSWER

How many numerical problem will come in 2019-20 board

Posted by Utkarsh Pal 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 6 months ago

You can check it here : https://mycbseguide.com/cbse-syllabus.html

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ANSWER

Why some alpha scattering particle can daevate at some distance in Rutherford experiment?

Posted by Ashu Tiwari 6 years, 6 months ago

CBSE > Class 12 > Physics

3 answers

Shivam Chaurasia 6 years, 6 months ago

Due to presence of positive charges at centre of atom enclosed by nucleus.

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Gursharn Kaur 6 years, 6 months ago

this can be explained as as we know that Alpha particles carries positive charge positive charges will get when it comes in contact with any positive charge sweet means at some what is present in the centre which repels the is alpha particles at some angle this body must contain a positive charge from the experiment presence of nucleus in Atom was detected

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Rajat Taragi 6 years, 6 months ago

Mani

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ANSWER

Derive an relation between permitivity and permeability of free space

Posted by Tawar Bana 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Anoop Yadav 6 years, 6 months ago

4 pi Epsilon naught is equals to one by 9 into 10 to the power 9 and Mu not upon 4 Pi is equals to 10 to the power minus 7 on multiplying both of these we get one by c Square which is square of the speed of light

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Aditya Dwivedi 6 years, 6 months ago

di electric constant = epslon upon epslon of air

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What is electromagnets and its properties???

Posted by Ayush Mishra 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Gursharn Kaur 6 years, 6 months ago

Electromagnet some metals which behave as electromagnets when electricity is passed through these metals the strength of this magnet can be increased by increasing the amount of current passing through the metal

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Two small magnets are placed horizontally perpendicular to the magnetic meridian their North poles are at 30 cm East and 20cm West from a compass needle if the compass needle remains undeflected compare the magnetic moment of the magnet

Posted by Akash Gupta 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

If only one charge is available, can it be used to obtain a charge many times greater than it in magnitude?

Posted by Pratibha Kumari 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

About .cyclotron

Posted by Yagvendra Verma 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Darshna T 6 years, 6 months ago

Read ncert

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K@Łp@N@ $Øđh!?? 6 years, 6 months ago

A cyclotron is a type of particle accelerator invented by Ernest O. Lawrence in 1929–1930 at the University of California, Berkeley, and patented in 1932. A cyclotron accelerates charged particles outwards from the center along a spiral path.

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ANSWER

Define 1 Henry and Weber

Posted by Mansi Vasava 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

K@Łp@N@ $Øđh!?? 6 years, 6 months ago

If a current of 1 ampere flowing through the coil produces flux linkage of 1 weber turn, the coil has a self inductance of 1 henry.‌ The unit is named after Joseph Henry (1797–1878), the American scientist who discovered electromagnetic induction independently of and at about the same time as Michael Faraday (1791–1867 ...

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Is a steady electric current the only source of mangnetic field ? Explain tha answer

Posted by Bablu Jyani Jyani 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Indu Singla 6 years, 6 months ago

Static charge does not produce magnetic field Static charge only produce electric field Moving charge produce magnetic field

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Gursharn Kaur 6 years, 6 months ago

Static charges give Rise to only electric field whereas dynamic charges to magnetic as well as electric field

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ANSWER

Insreasing the current sensibity of galvanometer may not neccearily increase its voltage sensibity. Give reason

Posted by Bablu Jyani Jyani 6 years, 6 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Who is here from fiitjee.....

Posted by Shubham Kumar Gupta 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Kumar Vishal Behera 6 years, 6 months ago

Me fiitjee bbsr

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ANSWER

A substance has critical angle 45° for yellow light. What is its refractive index ?

Posted by Rahul_ Ry(ʘ‿ʘ) 6 years, 6 months ago

CBSE > Class 12 > Physics

4 answers

Rahul_ Ry(ʘ‿ʘ) 6 years, 6 months ago

Thanks guys...✧◝(⁰▿⁰)◜✧

1Thank You

Shivam Chaurasia 6 years, 6 months ago

There is correction it wuld be√2 only.

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Sajid Ali 6 years, 6 months ago

√2

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Shivam Chaurasia 6 years, 6 months ago

1/√2.

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ANSWER

A cube which each side a is keptin an electric feildis given byE=CXi^ where c is positive dimensional constant find the electri flux through cube

Posted by Aryan Gurbani 6 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Shivam Chaurasia 6 years, 6 months ago

1/6q/epsilon not.

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ANSWER

Unit of intensity of electric field

Posted by Abdul Shehal 6 years, 6 months ago

CBSE > Class 12 > Physics

2 answers

Gursharn Kaur 6 years, 6 months ago

f is equal to q x e Q is charged and he is of course electric field intensity so easy equal to f upon q we know that f is equal to Newton and q is a kallukulam so we get the value of intensity of an electric field 2P Newton per coulomb

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Priya Priya 6 years, 6 months ago

Its same as that of electric field . that is "newton/columb "or "volt/meter"

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Kya ab sabhi paper ki Theory ab 80 marks ki aayegi?

Posted by Ashiq Mansoori 6 years, 6 months ago

CBSE > Class 12 > Physics