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

1. Electric field at axial point or at equatorial line. 2. Gauss theorem and application. 3. Young's double slit experiment. 4. Lens maker formula. 5. Different types of telescope with diagra

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How would you prepare yourself for board exams 2020-2021??

Posted by Stephen Jasmine 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Suman Kamat 5 years, 1 month ago

Make your concepts crystal clear

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Plz note the topic which is study in chapter 13 from SL ARRORA

Posted by Vansh Rana 5 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Compare the strength of electrostatic force and gravitational force for electron and proton

Posted by Lalitasharan Sharma 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Shreya Rajput 5 years, 1 month ago

It is given as an example in ncert Physics Term I in Chapter 1 , see there

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Important boards derivations

Posted by Shreya Dubey 5 years, 1 month ago

CBSE > Class 12 > Physics

4 answers

Bhumika Gupta 5 years, 1 month ago

1. Electric field at axial point or at equatorial line. 2. Gauss theorem and application. 3. Young's double slit experiment. 4. Lens maker formula. 5. Different types of telescope with diagram.

1Thank You

Tarun Kumar 5 years, 1 month ago

Drift velot relationship with electric field,bio svarts law,dipole,gaus law application etc..

0Thank You

Mamta Rangari 5 years, 1 month ago

Physics

8Thank You

Aahana ❄❄ 5 years, 1 month ago

For which subject

7Thank You

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a plane transverse wave is propagation in a direction making an angle 30 with positive x axes in cypress plane wavelength 1meter which is phase difference (000).(111)

Posted by Sri.Padilam V V Satyanarayana Ajchc 5 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Obtain the value of plank's constant from einstein's photoelectric equation

Posted by Shumugthaa Shanmugam 5 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Totally reflecting prism derivation.

Posted by Anushka Mishra 5 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Define one columb of charge.

Posted by Abhinav Agarwal 5 years, 1 month ago

CBSE > Class 12 > Physics

4 answers

Sanu ? 5 years, 1 month ago

@ anushka your answer is perfect ?

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Aahana ❄❄ 5 years, 1 month ago

One coulomb is that charge which repels an equal and similar charge with a force of ("9×10 power 9 Newton") ,when placed in vaccum or air at a distance of 1 meter from it

3Thank You

Student Of The Year 5 years, 1 month ago

1/1.6*10**-19= 6.241*10**18 electrons.

1Thank You

Tapan Pandey 5 years, 1 month ago

Yr ye sb nii aata

1Thank You

ANSWER

draw a pattern of electric field lines due to two positive charge placed a distance apart

Posted by Harsh Deep Kour 5 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why is the electric field always perpendicular to the surface of a conductor?

Posted by Karla B 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Bibek Naik 5 years, 1 month ago

electric field never exist parallel to the conductor if it exists in parallel to the conductor it will have no force which is not possible hence it always exist perpendicular to the surface.

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Two point charges placed at a distance R in air exert a force F on each other. At what distance will these experience the same force F in a medium of dielectric constant K?

Posted by Kashish Mandlecha 4 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 11 months ago

F (air) = (1/4 pi eo) [qQ/r²]
F(medium) = (1/4 pi eo*k) [qQ/R²]

given> F(medium) = F(air)
(1/4 pi eo*k) [qQ/R²] = (1/4 pi eo) [qQ/r²]
(1/k) [1/R²] = [1/r²]
kR² = r²
R² = r²/k
R = r/ [rootk]

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Which ch are most important for numerical problems (Physics)?guide please?

Posted by Vish ❄ 5 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Tapan Pandey 5 years, 1 month ago

2nd book

2Thank You

Sreehitha M 5 years, 1 month ago

Semiconductors and devices is more important Then chapters related to electricity like electric charges and fields, current, potential and capacitance etc.

2Thank You

Omer Farooq 5 years, 1 month ago

none of them are imp just don’t study and fail in exams you will feel relieved

8Thank You

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Hi guys can anyone please tell me about important topics or derivation of ch AC

Posted by Vish ❄ 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

K Sharma 5 years, 1 month ago

LCR circuit is most important one

1Thank You

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What are semiconductors explain

Posted by Pratham Mishra 5 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Sibani Dash 5 years, 1 month ago

Semiconductor are the materials which have a conductivity between conductors (generally metals) and non- conductors or insulators .

1Thank You

Vish ❄ 5 years, 1 month ago

The material which partially conduct electricity are called semiconductor for example Ge, Si.

2Thank You

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Derivation of magnetic field at the centre of current carrying loop

Posted by Tharrunya Cr 5 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

An object is placed 30 cm Infront of a plane convex lens with spherical surface of radius 20 cm .If refractive index of the material of the lens is 1•5 find the nature of the image

Posted by Dhanshree Boro 5 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Can any one tell me In which sample paper written at the bottom of right side pHY-1(×11) Like this☝️☝️☝️

Posted by Anjali Kumari??? 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Tapan Pandey 5 years, 1 month ago

Sorry didn't know:(

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Find out the electric field at the equatorial position due to a dipole?

Posted by Shruti Pandey 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Student Of The Year 5 years, 1 month ago

It is an important derivation you must learn it from YouTube.........

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What is a transformer

Posted by Parmeshwar Sai 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Karla B 5 years, 1 month ago

It is a device by which an alternating voltage can be increased or decreased.

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Hey? actually I am going to have my preboard and before this i have not given any offline exam and also i hadn't joined tution for Physics so i m having no idea regarding kind of qs gonna be asked & I'm quite nervous... I have done all cbse important questions provided in this app would it be helpful?? Any suggestions regarding please?

Posted by Vish ❄ 5 years, 1 month ago

CBSE > Class 12 > Physics

5 answers

Diti Urvija 5 years, 1 month ago

When is your exam

0Thank You

Vish ❄ 5 years, 1 month ago

Police Dav public, Ambala city

0Thank You

Anjali Kumari??? 5 years, 1 month ago

U r from which school?

0Thank You

Sumit Kumar Singh 5 years, 1 month ago

same problem bro

0Thank You

Student Of The Year 5 years, 1 month ago

Don't worry, it is helpful and be confident.

4Thank You

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Eid k din humara physics paper hai..??

Posted by Zeeshan Younis 5 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Zeeshan Younis 5 years, 1 month ago

Haan

0Thank You

Saniya Khan 5 years, 1 month ago

Eid k physics paper k din.??

1Thank You

ANSWER

A wire of length L n resistance R is stretched so the double and area is half of cross section half how will resistance change n resistivity

Posted by Tashi Angmo 5 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Gaurav Singh 5 years, 1 month ago

Resistivity does not depends on length and area but resistance depends on it so the new resistance will be four times of previous resistance. Resistance=resistivity×length/area.

0Thank You

Vipin Mishra 5 years, 1 month ago

Resistance will remain same And resistivity also b/c resistivity does not depend on length and area of conducter it depends on temp and nature of material

2Thank You

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increasing the charge on the plates of a capacitor means increasing the capacitance

Posted by Sarita Prajapat 5 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Nishant Pandey 5 years, 1 month ago

Yes, b'cause capacitance of a conductor is amount of charge required to increase its potential by 1 volt.

1Thank You

ANSWER

Iss bar Ki checking loose hogi ya strict hogi ???.....koi Bta sakta ha.....

Posted by ☞Cheenu☜ ▄︻̷̿┻̿═━一 ? 5 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Memer Hu 5 years, 1 month ago

Loose hogi ?

1Thank You

Madhu Shah 5 years, 1 month ago

Just like old

0Thank You

Lalit Chaudhary 5 years, 1 month ago

as old one

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Three charges each equal to +4nC are placed at the three corners of a square of side 2 cm. Find the electric field at the fourth corner.

Posted by Rahul. S 5 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

A Last 5 years, 1 month ago

Electric Field by two charge adjacent to fourth side= 2 ×9×10^9× 4/(2/100)^2 = 18×10^13N/C. Distance from farthest charge = 8^1/2= 2×2^1/2 . Electric field by this charge on fourth one= 9×10^9×4/((2×2^1/2)/100)^2 = 4.5×10^13 N/C. Total Electric Field = 10^13(18+4.5) = 22.5×10^13 N/C

1Thank You

A Last 5 years, 1 month ago

force by two charge adjacent to fourth side= 2 ×9×10^9× 4×4/(2/100)^2 = 7.2×10^14 Newton distance from farthest charge = 8^1/2= 2×2^1/2 force by this charge on fourth one= 9×10^9×4×4/((2×2^1/2)/100)^2 = 1.8×10^14 Newton Total Force = 10^14(7.2+1.8) = 9×10^14 Newton

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What is solid

Posted by Ankit Rai Yadav 5 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Shruti Rawat 5 years, 1 month ago

Solids have definite mass, volume,and shape

0Thank You

Deepanshu Khola 5 years, 1 month ago

Solids are those substances which have definite mass, volume and shape also in which the intermolecular distances are short and intermolecular forces are strong

1Thank You

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