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

Bro.. if you can't write in English then write it in Hindi. At least let us understand that what is the thing you are really stuck with so that we can help with that.

1Thank You

ANSWER

COHERENT AND INCOHERENT ADDITION OF LIGHT WAVES(wave optics). Is this topic is important for board exam ????

Posted by Mayank K. Mahour 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Aryan Rai 7 years, 2 months ago

Yes..bro.. we got questions from these topics in pre-board

1Thank You

ANSWER

What is a cell

Posted by Avni Aishaa 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Nitika Neb 7 years, 2 months ago

cell is used to maintain current in an electric circuit. ... Hence need arises to combine two or more cells to obtain a strong current.

0Thank You

Avni Aishaa 7 years, 2 months ago

Battery

0Thank You

ANSWER

What happened to the width of depletion layer of p-n junction when it is 1) Forward biased 2). Reverse biased

Posted by Arti Vishwakarma 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Aryan Rai 7 years, 2 months ago

In forward bias.. the region becomes small and in reverse bias the region becomes large.

2Thank You

Rana Sangram 7 years, 2 months ago

Small and large

2Thank You

ANSWER

An electric dipole consists of two charges of 0.1micro coloum seperated by an external field of 10to the power 2 N\C .what maximun torque does the field exert on the dipole ?

Posted by Sonali Poudyal 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is two laws of faradays

Posted by Rajeev Ranjan 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Which physical quantity is same for infra red and gamma rays?

Posted by Jogesh Padhaichand 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Nivedita Bagchi 7 years, 2 months ago

The speed of light is same for infra red and gamma rays.

5Thank You

ANSWER

What is magnetic flux in soleniod

Posted by Tsechu Dorjee 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

Magnetic flux is a measurement of the total magnetic field which passes through a given area. It is a useful tool for helping describe the effects of the magnetic force on something occupying a given area. The measurement of magnetic flux is tied to the particular area chosen. We can choose to make the area any size we want and orient it in any way relative to the magnetic field.

4Thank You

ANSWER

Explain hysteresis loop

Posted by Vandana Pathak 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

The word hysteresis means lagging behind. The phenomenon of lagging of intensity of magnetisation (M) behind magnetic intensity (H), when a specimen of magnetic material is subjected to a cycle of magnetization is called hysteresis.

For ferromagnetic materials, by removing external magnetic field i.e. H = 0, the magnetic moment of some domains remain aligned in the applied direction of previous magnetizing field which results into a residual magnetism. The lack of retracibility as shown in figure is called hysteresis and the curve is known as hysteresis loop.

0Thank You

ANSWER

Write about cyotron and it's application and workin

Posted by Aryan Bisht 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Krishna Chaurasia 7 years, 2 months ago

6tg

0Thank You

ANSWER

Why modulation are required

Posted by Azeem Mirza 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Sumit Kumar 7 years, 2 months ago

To reduce the height of antenna , to avoid mixing of signals, effective power radiation

0Thank You

ANSWER

Two circular coil X and Y having radii R and R/2 respectively are placed in horizontal plane with their center coincide with each other.Coil X has a current I flowing through in the clockwise sense. What must be the current in coil Y to make the total magnetic fields at the common center of the two coil zero. With same current flowing in the two coil if the coil Y is now lifted vertically upward through a distance R . what would be the net magnetic field at the center of coil Y ?

Posted by Purshottam Chaudhary 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The given figure shows field lines if a positive point charge. What will be the sign of the potential energy difference of a small negative charge between the points P and Q. Justify your answer.

Posted by Vivek Saini 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Sanjay Singh 7 years, 2 months ago

Positive because negative charge will move from low potential to high potential

1Thank You

ANSWER

What is the properties of electric charge?

Posted by Saurav Kumar 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Sanjay Singh 7 years, 2 months ago

Quantised...similar repel..opposite attract...conserved....produce electric field

1Thank You

ANSWER

Difference between pnp, npn - transistor . [CBSE sample paper 2019 ] .

Posted by H. S 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Arti Vishwakarma 7 years, 2 months ago

PNP transistor = Here, two thicker segments of p- type ( termed as emitter and collector ) are separated by a segments of n- type semiconductor ( base ). non transistor = Here, two thicker segments of n- type semiconductor ( emitter and collector ) are separated by a segment of p- type semiconductor ( base ).

0Thank You

ANSWER

The refractive index of a material medium for a given wavelength depends.

Posted by H. S 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Sanjay Singh 7 years, 2 months ago

Nature of mediums

0Thank You

ANSWER

As we know that same pole reples and opposite poles attract . Then why freely suspended magnet have north pole and south pole directed in geometrical north and south pole???

Posted by Chitransh Kumawat 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

S M 7 years, 2 months ago

Freely suspended magnets align in the magnetic meridian. as we have two meridians magnetic and geographic median magnetic south is towards geographic north and magnetic north is towards geographic south hence magnets' north pole is towards geographic north.

0Thank You

ANSWER

The reason of One side deflection in galvanometer ??

Posted by Shakil Khan 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Si unit of electric susceptibility

Posted by Harsh Shirra 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Arti Vishwakarma 7 years, 2 months ago

In SI units the electric susceptibility is defined by the equation P = ϵ 0 χ E which relates the polarization per unit volume to the electric field and is the free space permittivity.

1Thank You

ANSWER

What is interference? Plz also tell me what is constructive and destructive interference?

Posted by Shaista Siddiqui 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Aryan Rai 7 years, 2 months ago

If intensity of wave produced after interference is maximum then it is said to be constructive. And if intensity of wave produced after interference is minimum then it is said to be destructive interference.

1Thank You

Aryan Rai 7 years, 2 months ago

When two or more waves cross a point simultaneously then,it is called interference. It follows principle of superposition.

1Thank You

ANSWER

Which is the best guide which can be used to reffer in 12th??

Posted by Vivek R 7 years, 2 months ago

CBSE > Class 12 > Physics

1 answers

Deepti Choudhary 7 years, 2 months ago

Right now You should focus on the extra book you are studying from the starting for year and If not then you should Go through last year papers and Xam idea

0Thank You

ANSWER

Derive an expression for the distance upto which TV signals can directly be received from a tower of height H?

Posted by Divya Sharma 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Could you guys post the binding enrgy curve having binding energy per nucleon verses the mass no for elements from hydrogen to uranium with explanation??

Posted by Vivek R 7 years, 2 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why there is no work done in moving a charge from one point to another on an Equipotential surface ?

Posted by Arti Vishwakarma 7 years, 2 months ago

CBSE > Class 12 > Physics

2 answers

Arti Vishwakarma 7 years, 2 months ago

Thanks Avdesh Giri

0Thank You

Avdesh Giri 7 years, 2 months ago

The equipotential surfaces are those where the electric field at every point is equal thus potential difference between two points is zero.As we know : W=charge × potential difference W=charge × 0 W=0 Hence the work done is zero

1Thank You

ANSWER

A glass rod when rubbed with silk cloth acquires a charge 1.6*10.C . What is the charge on the silk cloth

Posted by Aradhya Dwivedi 7 years, 2 months ago

CBSE > Class 12 > Physics