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

Biot-Savart Law, Ampere's Circuital Law and its proofs, loop numericals, cyclotron, magnetic field due to a current carrying loop. These you should know by heart, please see other derivations too because in 2018, magnetic dipole moment of a revolving electron came unexpectedly!

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Nivetha Vijayakumar 7 years ago

Biot Savart's law, Ampere's circuital law, then see all the formulas. That's it.

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Why is compound microscope perfrred over a simple microscope

Posted by Yogender Singh 7 years ago

CBSE > Class 12 > Physics

1 answers

Nivetha Vijayakumar 7 years ago

Compound microscope has 2 lens which magnifies the image more.

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ANSWER

How is your preparation ? Good, I think.

Posted by Sakshi Singh 7 years ago

CBSE > Class 12 > Physics

1 answers

Utsav Aryan 7 years ago

Very bad

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what is the function of rectifier and envelop detector in communication system

Posted by Milisha Gupta 7 years ago

CBSE > Class 12 > Physics

1 answers

Ash Thunderbird ✔ 7 years ago

Rectifier converts AC into DC. Envelope Detector is a RC circuit that detects the envelope. Both plays a crucial role in the detection process, i.e, recovering the modulating signal from AM wave.

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Whats going on

Posted by Abc Kumar 7 years ago

CBSE > Class 12 > Physics

1 answers

Shriya Gautam 7 years ago

Trying to deal with physics??

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Is it possible that terminal potential difference across a cell be zero?

Posted by Prem Raj 7 years ago

CBSE > Class 12 > Physics

1 answers

Peeyush Sharma 7 years ago

Ideal situation !

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TIR

Posted by Bígré Ñáwáb 7 years ago

CBSE > Class 12 > Physics

1 answers

Nivetha Vijayakumar 7 years ago

Total internal reflection: When the light ray travels from denser medium to rarer medium and if the incident angle is more than critical angle, then the light ray is reflected back to the same denser medium. This phenomenon is called Total internal reflection.

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Would anyone kindly tell me some important topics from Alternating Current? (Except Transformers)

Posted by Ash Thunderbird ✔ 7 years ago

CBSE > Class 12 > Physics

1 answers

Peeyush Sharma 7 years ago

LCR circuit, Along with resonant frequency and quality factor !

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Name the electromagnetic radiation used for water purification?

Posted by Jitendra Singh 7 years ago

CBSE > Class 12 > Physics

2 answers

Ritika Aneja 7 years ago

Ultraviolet rays

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Prem Raj 7 years ago

Ultraviolet radiation

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Makers formula

Posted by Wangthoi Tongbram 7 years ago

CBSE > Class 12 > Physics

1 answers

Rohindh Kishore 7 years ago

1/f = (n21-1) [ 1/R1 - 1/R2]

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Relation between refractive index and ccritical angle of a medium?

Posted by Tanisha Jaiswal 7 years ago

CBSE > Class 12 > Physics

1 answers

Prem Raj 7 years ago

n=1/sin c

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How to calculate RMS voltage and current

Posted by Harsha Phansalkar 7 years ago

CBSE > Class 12 > Physics

1 answers

Deepa Singh Parihar 7 years ago

Erms=E°/√2 Irms=Erms/R

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Is the derivation of mirror formula is very important in exams ?

Posted by Mahi Upreti 7 years ago

CBSE > Class 12 > Physics

3 answers

Ritika Aneja 7 years ago

Lens maker is more important

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Nitish Sharma 7 years ago

Bro...both r important

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Mahi Upreti 7 years ago

And what about lens maker formula ?

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What is the electric flux through a cube of side 1cm which encloses an electric dipole

Posted by Reenu Tiwari 7 years ago

CBSE > Class 12 > Physics

1 answers

Kartik Periwal 7 years ago

Zero

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Is transistor as a switch included in latest physics syllabus

Posted by Sonam Malik 7 years ago

CBSE > Class 12 > Physics

2 answers

Deepa Singh Parihar 7 years ago

Yes ,when for Ic the value of Ib is 0 , Below that region the transistor act as switch .(((Reverse characteristica of transistor..)))

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Hanu Saini 7 years ago

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What must be the sequence of attempting the physics paper and what must be the time allotment

Posted by Hanu Saini 7 years ago

CBSE > Class 12 > Physics

2 answers

Ritika Aneja 7 years ago

Start your exam in its sequence only by first attempting 1 mark ques then 2 mark then 3 and then 5 mark ques .. it will be more better ..

1Thank You

Yashika Moudgil 7 years ago

Start with 5 marks questions and give it 45 minutes and then do 3 marks questions and bind this within 1 hour and then do 2 and 1 mark questions within 30 minutes...

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Astronomical telescope lens select with example

Posted by Rekha Singh 7 years ago

CBSE > Class 12 > Physics

0 answers

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Define modulation index and and write its expression

Posted by Abhishek Narula 7 years ago

CBSE > Class 12 > Physics

2 answers

Ash Thunderbird ✔ 7 years ago

Modulation Index (meu) is the ratio of change in the amplitude of carrier wave to the amplitude of the carrier wave. u = Am/Ac = Amax - Amin / Amax + Amin

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Dhruv Bansal 7 years ago

modulation index has no unit ma = E max + E min/E max - E min

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Is ncert enough for physics board exam?

Posted by A Sri 7 years ago

CBSE > Class 12 > Physics

2 answers

Gopal M 7 years ago

No NCERT is only sufficient for chemistry not for physics

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Harsha Phansalkar 7 years ago

Yes more than enough

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2 Application of Gauss Law.

Posted by Ajeet Aryan 7 years ago

CBSE > Class 12 > Physics

2 answers

Nitish Sharma 7 years ago

Bro...it is an important topic...dont miss it

0Thank You

A Sri 7 years ago

It could be used for finding electric field due to infinite long wire, uniformly charged plane sheet, spherical shell etc

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What' is Quantization of charge

Posted by Vishal Dubey 7 years ago

CBSE > Class 12 > Physics

2 answers

Jewel Maria 7 years ago

charge of a body is the integral multiple of the basic quantum of charge (e). q=ne

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Lucky Stuntman 7 years ago

Q=ne I=q/t I=ne/t

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Imp.topics of optics???????

Posted by Sunita Rastogi 7 years ago

CBSE > Class 12 > Physics

1 answers

Nitish Sharma 7 years ago

Ray Optics & Optical Instruments (important Topics):-) - Reflection from Speherical Mirrors and find relation b/w f & R. - Mirror formula using Concave and Convex Mirror. - Total Internal Reflection ( definition + applications & numerical ) (v.imp) - Refraction through spherical surfaces (convex and concave) - Lens Makers Formula (derivation & numerical) - Refraction through a glass prism & minimum angle of deviation. - Scattering of light (Blue colour of sky, reddish appearance of the sun at sunrise and sunset) // theory (imp) - Optical Instruments (Ray Diagram & Numerical) //(gauranteed qs) These will surely help you Sunita.All the Best for physics Exam ?

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How to score 90+ in phy

Posted by Ravi Sharma 7 years ago

CBSE > Class 12 > Physics