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

Ask questions which are clear, concise and easy to understand.

Ask Question

What is wavelets??

Posted by Deepak Chaurasiya 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Manish Yadav 7 years, 1 month ago

The secondary wave which act as a fresh source is known as wavelets in accordance with huygens principles

0Thank You

Yogita Ingle 7 years, 1 month ago

Huygens principle states that each point of a wavefront is the source of secondary wavelets (small waves) which spread in all directions with the speed of the wave.
The new wavefront is formed by drawing a line tangent to all the wavelets.

0Thank You

ANSWER

What is the meaning of permittivity

Posted by Vaibhav Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 1 month ago

The electrical primittivity is a quantity which is a measure of how much resistance the electric lines of force encounter while forming an electric field in a particular medium . It is denoted by ε. The permittivity of free space (a vacuum) is a physical constant equal to approximately 8.85 x 10^-12 farad per meter (F/m).

0Thank You

ANSWER

What is spherical aberration?

Posted by Daksh Kesarwani 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sourabh Sheokand 7 years, 1 month ago

When the incoming rays are not parallel to principal axis (angle between them more than 10 degrees) then the image are not only at one focus but there are a no. of focus and it is correct it by parabolic mirror

4Thank You

ANSWER

A current of 5A is passing through a metallic wire of cross-section area 4×10 power -6. If the density of the charged carrier in the wire is 5×10 power 26/m3, the drift velocity of the electron is.....????

Posted by Pratibha Ydv 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sourabh Sheokand 7 years, 1 month ago

1.5625m/s . I=neAv I=current n=Density of charge carrier e=charge on electron A=area of cross section v=drift velocity

1Thank You

ANSWER

What is angular dispersion?

Posted by Prashant Sangwan 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Akshra Gupta 7 years, 1 month ago

Lateral displacement is define as the distance between actual path of incident Ray and refracted Ray in glass slab

2Thank You

ANSWER

What is prism formula

Posted by Gurkiarat Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Prashant Sangwan 7 years, 1 month ago

U=sin(A+sm/2)/sinA/2

2Thank You

ANSWER

Any working model

Posted by Rishabh Mohan 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Tarun Goswami 7 years, 1 month ago

Rectifier half wave ya full

1Thank You

Prashant Sangwan 7 years, 1 month ago

Hydraulic bridge

1Thank You

ANSWER

If N cell are combined in parallel with their internal resistance then total current I in circuit with external resistance R is

Posted by Daulat Singh Hada 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Law of conservation of energy

Posted by Bipin Verma Bippu 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Niharika Sharma 7 years, 1 month ago

According to this law the total energy of a system remains conserved. "This law states that energy can neither be created nor be destroyed, only one form of it can be transferred or transformed into another. "

0Thank You

ANSWER

Drive i=neavd

Posted by Sahil Gehra 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Name the current which can exist even in the absence of electric chagre

Posted by Sahil Srivastava 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Joshua M 7 years, 1 month ago

Displacement current

2Thank You

Shikshit Rana 7 years, 1 month ago

eddy curreny

1Thank You

ANSWER

Bionomial opration how use in question

Posted by Shailesh Chauhan 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is locus

Posted by Satyam Chimaniya 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Omkar Gaur 7 years, 1 month ago

esp. the place where something occur

1Thank You

Amandeep Kumar 5 years, 8 months ago

Focous ka bhai locus

0Thank You

ANSWER

What is the ocean thermal energy...

Posted by Diljani . 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Ravi Kumar 7 years, 1 month ago

Bhai vishal study app to social site mat banao

0Thank You

Akshit Loria 7 years, 1 month ago

the temperature between the warm surface water and cool deep water to run a turbine and produce electricity. Water, as we all know has a high specific heat and this enables it to store the solar thermal energy as sensible heat. 70% of earth’s surface area is occupied by the oceans and this makes them a huge store house of incident solar thermal radiation on them.

2Thank You

ANSWER

Guys online study ke liye examfear channel on youtube is good or bad

Posted by Abc Kamboz 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Shreya Bhardwaaj 7 years, 1 month ago

If u are able to understand it so its good otherwise not ...... But its

1Thank You

ANSWER

How would you arrange 90 cells each of emf 1.5 V and internal resistance 0.2 ohm to send maximum current through an external resistance of 0.5 ohm calculate the maximum current

Posted by Abc Kamboz 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Abc Kamboz 7 years, 1 month ago

Please give me solution of this quesss....

0Thank You

ANSWER

The emf of a battery 2V and its internal resistance is 2 ohm. Its potential difference is measured by a voltmeter of resistance 998 ohm. Calculate the percentage error in reading of emf shown by the voltmeter.

Posted by Abc Kamboz 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Explain the causes of displacement current.

Posted by Tisham Routh 7 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Shreya Bhardwaaj 6 years, 11 months ago

Ha almost complete ho gya he

0Thank You

Kaushik Suthar 7 years, 1 month ago

When the capacitor is charging and discharging, current flows through the wires creating a magnetic field, but between the plates of the capacitor, there is no current flowing. According to Ampere's law there can be no magnetic field created by the current here, but we know that magnetic field does in fact exist. Maxwell realized this discrepancy in Ampere's law, and added the following term to Ampere's Law to resolve the issue.Equation is given in your ncert book.This final form of the equation is known as the Maxwell-Ampere Law, and the part Maxwell added to it is what we call displacement current.

1Thank You

ANSWER

Three Equal Charges Each having Magnitude

Posted by Akash Panwar 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Is there is any change in physics board class 12 paper 2018-19???

Posted by Deepak Kumar 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Drake Verma 7 years, 1 month ago

No brother not any big changes in the paper....but yes the internal questions (optional) ques are increased by 33%. Which is gud for us as it will give us a vivid chance to get the full marks by attempting the question which we know..

3Thank You

ANSWER

Half topic dikhata h ye unit k

Posted by Ritu Yadav 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to score 70/70 in physics class 12

Posted by Harsh Sharma 7 years, 1 month ago

CBSE > Class 12 > Physics

4 answers

G K 7 years, 1 month ago

??....

0Thank You

Lakshya Gaur 7 years, 1 month ago

Apna phone kachre me dalo tv kabad me fake do

2Thank You

Ritu Yadav 7 years, 1 month ago

Km se km 4 hour physics pdho

4Thank You

Pritesh Hirani 7 years, 1 month ago

For this practice more and more

4Thank You

ANSWER

Mai konse 3 chapter easy wale study karu pass hone ke liye boards me

Posted by Shivani Mishra 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Drake Verma 7 years, 1 month ago

1) optics kr dalo 2) Electrostatics 3)Ac current Agr yeh 3 kr diya dhang se toh bilkul pass ho jaonge aap..pr shrt h ki inko bilkul ghol ke peena pdega mtlb sare ques kr skho inme se...waise jyada mushkil nhi aate inme se derivation part jyada hota h inme

0Thank You

ANSWER

May konse easy chapter learn kru pass honey k liye

Posted by Suyash Sharma 7 years, 1 month ago

CBSE > Class 12 > Physics

4 answers

Himanshu Negi 7 years, 1 month ago

Ch-5,8,9,11,12,13,14,15

1Thank You

Deepak Kumar 7 years, 1 month ago

Electromagnetic induction

0Thank You

Deepak Kumar 7 years, 1 month ago

Coulombs law

0Thank You

Deepak Kumar 7 years, 1 month ago

Optics

0Thank You

ANSWER

show the variation of capacitive reactance with frequency and time period.

Posted by Tisham Routh 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Biot savert law in vector form

Posted by Nagendra Singh 7 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why are alloys like eureka or constantin are used in standard resistance.

Posted by Manav Rathore 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Rohan Mehta 7 years, 1 month ago

Because of their low resistivity

0Thank You

ANSWER

How to change galvanometer in voltmeter and ammeter

Posted by Rajat Shukla 7 years, 1 month ago

CBSE > Class 12 > Physics

4 answers

Sejal Vichare 7 years, 1 month ago

To change the galvanometer into ammeter by using the external resistance i.e. shunt resistance in parallel with galvanometer and to convert into voltmeter we have to connect the galvanometer in series

0Thank You

G K 7 years, 1 month ago

Thnx dost?

2Thank You

Karan Kumar 7 years, 1 month ago

Gud job megha very nice

1Thank You

G K 7 years, 1 month ago

Galvanometer into an Ammeter---> a very low resistance is connected in parallel to Galvanometer.......... Galvanometer into voltmeter,---> a very high resistnce is connected in series with the galvanometer......

2Thank You

ANSWER

Can i can complete physics in just 4 months from the beginning of chapters

Posted by Kashif Habib 7 years, 1 month ago

CBSE > Class 12 > Physics