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

Principal resolving power will not change with the change in focal length. But of course magnification depends on the focal length and it is directly proportional to the focal length of objective lens so if you increase the focal length of objective then the magnification will increase.

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An Alpha particle is accelerated from rest through a potential of V volt its final kinetic energy is

Posted by Prachi Raj 6 years, 3 months ago

CBSE > Class 12 > Physics

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How to associate a vector to the area of a curved surface?

Posted by Humaira .. 6 years, 3 months ago

CBSE > Class 12 > Physics

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Want MCQ questions for each and every chapter

Posted by Ranjita Ghosh 6 years, 3 months ago

CBSE > Class 12 > Physics

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If we touch the rod with body then wjat will happen

Posted by Aman Brar 6 years, 3 months ago

CBSE > Class 12 > Physics

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Swati Singh 6 years, 3 months ago

Rod....???Is it charged? Or warmed...???n which body????SORRY ! YOUR QUESTION ISN'T COMPLETE.

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Electric field lines due to single charge and double charge

Posted by Singa Tusing 6 years, 3 months ago

CBSE > Class 12 > Physics

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Sia ? 6 years, 3 months ago

Equipotential surfaces due to a single point charge are concentric sphere having charge at the centre. Electric field lines are always normally outwards from the spherical surfaces.

Electric field lines due to an electric dipole are shown in figure in which electric field lines originating from +q is terminating on -q. There is only one electric filed line which is passing straight from +q to -q , remaining electric field lines they follow path which is trajectory originating from +q is terminating on -q .

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2019-20 in physics first 20 questions are in mcq form or vsa type question ???

Posted by Vanshika Kaushik 6 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Priya Dharshini 6 years, 3 months ago

Both are possible... may be 10 marks mcq and other 10 vsa

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Hritika Singh 6 years, 3 months ago

Objective questions.

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Sia ? 6 years, 3 months ago

Objective Questions

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Two point charges 10 into 10 to power minus 8 coulomb and minus 4 into 10 to power minus 8 coulomb are separated by a distance of 70 cm in air and at what distance from point a would the electric potential be zero also calculate the electrostatic potential energy of the system give answer

Posted by Ritu Negi 6 years, 3 months ago

CBSE > Class 12 > Physics

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Two point charges 10 into 10 to power minus 8 coulomb and minus 4 into 10 power minus 8 coulomb are separated by a distance of 70 centimetre in air is find at what distance from point a would the electric potential be zero also calculate the electrostatic potential energy of the system

Posted by Ritu Negi 6 years, 3 months ago

CBSE > Class 12 > Physics

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Sky is blue why?

Posted by Kishan Salvi 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years, 3 months ago

The blue colour of the sky is due to the scattering of the sunlight by the molecules present in the atmosphere.
The molecules of air, such as N₂ and O₂, have sizes smaller than the wavelength of visible light. These molecules absorb some amount of sunlight and re-emit it, as sunlight passes through the atmosphere.
Blue light of shorter wavelength is scattered more strongly than red light of longer wavelength. This scattered light contains blue light in a larger proportion and it enters our eyes. That is why the sky appears blue.

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What is Isolated System? What Is Quantization?

Posted by Abhinav Raj 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Gaurav Seth 6 years, 3 months ago

A sytem which can neither exchange energy nor matter with its surroundings is an isolated system

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Gaurav Seth 6 years, 3 months ago

Quantization of charges:

The charge is always represented in the form of, q = ne. Here n is an integer and e is the charge (- for electron and + for proton). Magnitude of e = 1.602192 X 10^-19This is called quantization of charge.
SI unit of charge is Coulomb (C).
Quantization is usually ignored at macroscopic levels (μC) because at that point, charges are taken to be continuous.

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student connects four cells each of emf 1.5 volt and internal resistance of 0.25 ohm in series but one cell has its terminals reversed this battery sends current in a 2 ohm resistor what is the current

Posted by Shivangi Yadav 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Navjot Kaur 6 years, 3 months ago

because according to me its answer is 1.25 ampere. It may be right or wrong

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Navjot Kaur 6 years, 3 months ago

If you know please tell me the exact answer of this question

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The susceptibility of paramagnetic substance is-

Posted by Saloni Kumari 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Sayeda Iram Ateeq 6 years, 3 months ago

Susceptibility of paramagnetic substance is small and positive.

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The stored energy of a capacitor charged to 100 V 1 J capacitance of the capacitor is _

Posted by Saloni Kumari 6 years, 3 months ago

CBSE > Class 12 > Physics

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What is terristial magnetism?

Posted by Archana Uchawla 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 3 months ago

Terrestrial magnetism is the magnetic properties of the earth as a whole.

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What is guass law and application of guass law,electric flux?

Posted by Divyanshu Mishra 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Divyanshu Mishra 6 years, 3 months ago

Thanks for reply f my question

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Archana Uchawla 6 years, 3 months ago

According to gauss theorem the net electric flux in any closed surface is equal to 1/epsilon.0 times the total charge present in that closed surface. The total no. Of electric line of force passing perpendicularly to the surface in an electric field is electric flux.

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What is dc generator?

Posted by Shrikant Chauhan 6 years, 3 months ago

CBSE > Class 12 > Physics

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Are value based questions in syllabus

Posted by Ayan Tiwari 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 3 months ago

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

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Does logic gate is there in ur syllabus???

Posted by Riya Thakur 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Riya Thakur 6 years, 3 months ago

Means it is not deleted by cbse

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Swati Singh 6 years, 3 months ago

Yes...

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What should be the properties of standard resistance?

Posted by Rohan Tesla 6 years, 3 months ago

CBSE > Class 12 > Physics

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How to study physics for board exam

Posted by Divyansh Jain 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 3 months ago

You should regularly read and practice physics, from your school textbook (Eg: NCERT). You need to make a good balance between numerical problems and definitions or theoretical problems.

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A heating element is marked 210v, 630w . what is the value of current drawn from by the element when it is connected to a 210 v dc across?

Posted by Pras Anna 6 years, 3 months ago

CBSE > Class 12 > Physics