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..

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What do you mean by work function?

Posted by Shahal Muhammed 7 years ago

CBSE > Class 12 > Physics

1 answers

Sunnny Xdr 7 years ago

Minimum energy required to emit a electron from a metal surface

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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 7 years ago

CBSE > Class 12 > Physics

2 answers

Sunnny Xdr 7 years ago

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

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Sunnny Xdr 7 years ago

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

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Which are the important derivations

Posted by Aniket Gaonkar 7 years ago

CBSE > Class 12 > Physics

1 answers

Sunnny Xdr 7 years ago

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

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what r the important derivation

Posted by Vivek Kumar 7 years ago

CBSE > Class 12 > Physics

1 answers

Khushi Pandey 7 years ago

Aman dhattarwal on YouTube

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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 7 years ago

CBSE > Class 12 > Physics

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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 7 years ago

CBSE > Class 12 > Physics

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

Posted by Ram Shabad 7 years ago

CBSE > Class 12 > Physics

1 answers

Anjana Patel 7 years ago

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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 7 years ago

CBSE > Class 12 > Physics

1 answers

Ram Shabad 7 years 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

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

Posted by Gourav Verma 7 years ago

CBSE > Class 12 > Physics

1 answers

Gourav Verma 7 years ago

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

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

Posted by Fathimath Ziyana 7 years, 1 month ago

CBSE > Class 12 > Physics

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Why field lines are perpendicular to the surface in conductors?

Posted by Jyotishmita Kurmi 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Ram Shabad 7 years 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

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Imp topic from all chapters

Posted by Deeksha Nimje 5 years, 10 months ago

CBSE > Class 12 > Physics

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State law of Malus?

Posted by Sahil Saini 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Jyotishmita Kurmi 7 years, 1 month 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

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What is RADAr

Posted by Utkarsh Mishra 7 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Andy King 7 years, 1 month 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.

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Van de graff generator ? Explain

Posted by Surbhi . 7 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Jyotishmita Kurmi 7 years, 1 month ago

Ommitted topic for 2019

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Supandeep Singh 7 years, 1 month ago

i dont know

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Sahil Saini 7 years, 1 month 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)

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What is Parallel plate capacitor???

Posted by Surbhi . 7 years, 1 month ago

CBSE > Class 12 > Physics