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

Direction of electric feild is need to be considered..- electric filed radiate inward while + electric field radiate otward..draw arrows on both side of sheet..if arrows from diiferent sheet are in oppposite directon electric field are substracted and if they are in same direction they are added..

1Thank You

ANSWER

What do you mean by work function?

Posted by Shahal Muhammed 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Sunnny Xdr 6 years, 10 months ago

Minimum energy required to emit a electron from a metal surface

0Thank You

ANSWER

Two infinitely positively charged parallel sheets having surface charge densities sigma1 & sigma2 ,sigma1>sigma2 . Write the magnitude of net field in b/w the sheets and on the right side of 2nd sheet????

Posted by Khushi Pandey 6 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Sunnny Xdr 6 years, 10 months ago

Sry..posted wrong ans..between S1-s2 and on right S1+S2

1Thank You

Sunnny Xdr 6 years, 10 months ago

Between ...s1 + s2..on right side S1-S2

0Thank You

ANSWER

Which are the important derivations

Posted by Aniket Gaonkar 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Sunnny Xdr 6 years, 10 months ago

Go through past ques papers nd ull get idea of imp derivations

0Thank You

ANSWER

what r the important derivation

Posted by Vivek Kumar 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Khushi Pandey 6 years, 10 months ago

Aman dhattarwal on YouTube

1Thank You

ANSWER

A symmetric biconvex lens of radius of curvature R and made of glass of refractive index 1.5 is placed on a layer of liquid placed on top of a plane mirror add shown in the figure. An optical needle with its tip on the principal axis until it's real, inverted image coincides with the needle itself. The distance of the needle from the lens is measured to be x. On removing the liquid l layer and repeating the experiment, the distance of found to be y. Obtain the expression for the refractive index of the liquid in terms of x and y.

Posted by Nisha Walia 6 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A radioactive isotope has a half life of 10yrs . How long will it take for the activity to reduce to 3.125

Posted by Nisha Walia 6 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

frequency of photon change on medium when travel one medium to another ?yes explain it

Posted by Ram Shabad 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Anjana Patel 6 years, 10 months ago

0Thank You

ANSWER

Two insulated charged copper is sphere A and B of identical size have charges Qa and Qb respectively. A 3rd sphere C of the same size but uncharged is brought in contact with the first and then his contact with the second and finally removed from both. what are the new charge on A and B?

Posted by ठाकुर अजीत प्रताप सिंह 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Ram Shabad 6 years, 10 months ago

This is concept of charge near by the uncharge body her potential is equal all charge body and apply coloumb low ang find new charge

1Thank You

ANSWER

Why is short wave band used for long distance radio broadcast ?

Posted by Gourav Verma 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Gourav Verma 6 years, 10 months ago

Because short wave is easily reflected back to the earth from ionosphere.

1Thank You

ANSWER

The charging current for a capacitor is 0.25 A. What is the displacement current across its plates

Posted by Fathimath Ziyana 6 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why field lines are perpendicular to the surface in conductors?

Posted by Jyotishmita Kurmi 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Ram Shabad 6 years, 10 months ago

Becouse it inside the electic field is zero and only surface of sphare is electric field and the proprty of electric line is always move stright and dont inter sect it hance that why

0Thank You

ANSWER

Imp topic from all chapters

Posted by Deeksha Nimje 5 years, 8 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

State law of Malus?

Posted by Sahil Saini 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Jyotishmita Kurmi 6 years, 10 months ago

When a beam of completely plane polarised light is passed through analyser, the intensity 'I' of transmitted light varies directly as the square of the cosine of the angle theta between the transmission directions of polariser and analyser

2Thank You

ANSWER

What is RADAr

Posted by Utkarsh Mishra 6 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Andy King 6 years, 10 months ago

RADIO direction and ranging Radar was developed secretly for military use by several nations in the period before and during World War II. ... The term RADAR was coined in 1940 by the United States Navy as an acronym for RAdio Detection And Ranging or RAdio Direction And Ranging.

1Thank You

ANSWER

Van de graff generator ? Explain

Posted by Surbhi . 6 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Jyotishmita Kurmi 6 years, 10 months ago

Ommitted topic for 2019

0Thank You

Supandeep Singh 6 years, 10 months ago

i dont know

0Thank You

Sahil Saini 6 years, 10 months ago

It is an electronic device.which is used to carry (+)ive charged particles through an insulating belt.It is mostly used in necluar reactions.(This topic is cutoffed from CBSE)

2Thank You

ANSWER

What is Parallel plate capacitor???

Posted by Surbhi . 6 years, 10 months ago

CBSE > Class 12 > Physics