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

You should not take any burden about this and see some videos on YouTube for important Q .you can also take a clue from previous years question papers

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Can please anyone tell me the proper syllabus for the preparation I am really confused

Posted by Madhu Singh 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Madhu Singh 6 years, 3 months ago

Can you please attach the pdf cause i am not able to find the correct one

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Ravi Sinhmar 6 years, 3 months ago

You can check syllabus from net

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What is galanometer

Posted by Sachin Kumar 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 3 months ago

Moving coil galvanometer is an electromagnetic device that can measure small values of current. It is also known as Weston galvanometer.
It works on the principle that when a current loop is placed in an external magnetic field, it experiences torque, and the value of torque can be changed by changing the current in the loop
Moving coil galvanometer consists of permanent horse-shoe magnets, coil, soft iron core, pivoted spring, non-metallic frame, scale and pointer

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Application of biot severt law

Posted by Sachin Kumar 6 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Shreyas Neelamahadev 6 years, 3 months ago

Ghfgc

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Shreyas Neelamahadev 6 years, 3 months ago

Biotsavart law(or)laplace law... >. Directly proportional to the strength of the electric current. >. Directly proportional to length of the current element. >. Directly proportional to the sign of the angle b/w the current element & the line joining the point at which magnitude field is calculated. >. Inversely proportional to the square of the distance b/w the current element & the point at which the magnetic field is calculated. - SHREYAS.M.N.REDDY STUDENT OF AKSHARA COLLEGE 2nd puc (ANAKAL)

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Yogita Ingle 6 years, 3 months ago

Some of Biot-Savart’s Law applications are given below.

We can use Biot–Savart law to calculate magnetic responses even at the atomic or molecular level.
It is also used in aerodynamic theory to calculate the velocity induced by vortex lines

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Why electrostatic fields are not discontinuos

Posted by Virendra Maurya 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Rohit Kumar 6 years, 3 months ago

If they will be discontinuos then at the breaked point no tangent can be formed means no electric force but the force due to electric field is noticed so it cannot be discontinuos

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When current in a coil change s with time how is back emf induced in coil???

Posted by Himanshu Srivastava 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Ravi Sinhmar 6 years, 3 months ago

Due to change in magnetic flux

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Ayush Singh 6 years, 3 months ago

By eddy current

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Magnetic Lorentz force kya hh

Posted by Himanshu Srivastava 6 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Ravi Sinhmar 6 years, 3 months ago

Yow can see the principle of cyclotron .When a charged particle placed inside a electric field and a magnetic field it experience some force called Lorentz force.

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Venkadalakshmi Kannappan 6 years, 3 months ago

Lorentz force is the sum of electrostatic force and magnetic force

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Purnika Rani 6 years, 3 months ago

Force experienced by charged particle due electric and magnetic field Vector F=q(vector E+vector v×vector B)

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Why did sun looks red in sunset from Earth but looks blue from mars. ????

Posted by Himanshu Srivastava 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Sahdeo Koche 6 years, 3 months ago

Due to different kinds of dust particles with water droplets in air present it makes our eyes to see ⛅ sun red

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Saksham Banyal 6 years, 3 months ago

Due to its different atmosphere in comparison to Earth ?.

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What is lenz's law??

Posted by Aditya Kumar 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Ravi Sinhmar 6 years, 3 months ago

Acc. to this law palarity of induced emf is such a way that it always oppose change in flux linked with that coil

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Sia ? 6 years, 3 months ago

Lenz's law is a common way to understand how electromagnetic circuits obey Newton's third law and the conservation of energy. Lenz's law is named after Heinrich Lenz, and it says: An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the change in original magnetic flux.

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from where numerical is sufficient for board exam 12

Posted by Paras Sharma 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Ravi Sinhmar 6 years, 3 months ago

NCERT and previous year question papers enough

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Raman Brar 6 years, 3 months ago

Last 10 year cbse paper

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What is potentiometer? Give its two uses.

Posted by Sejal Uniyal 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Raman Brar 6 years, 3 months ago

It is device which works on principal that potential dropage is directly propotional to length of wire used.it is used to measure internal resistance and potential difference.

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Taking the wavelength of first balmer line in hydrogen spectrum (n=3 to n=2)as 660nm,the wavelength of 2nd balmer line (n=4 to n=2)will be:

Posted by Shivanand Kamat 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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What do you mean by optics

Posted by Prakash Mandal 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

R_ Sandhu_ 6 years, 3 months ago

Simply, Optics is study of light which is further divided into ray optics and wave optics Ray optics: Dimensions of objects are much bigger than wavelength of the light Wave Optics: Dimensions of objects are comparable to wavelength of light.Example : Diffraction, polarisation

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What is refaction

Posted by Riad Waka 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Riad Waka 6 years, 3 months ago

How many devices in physics

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Raman Brar 6 years, 3 months ago

When light ray passes from one medium to another then it bend or move away from normal which is called refrection.

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What is Flux?

Posted by Golden Rehan 6 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Himanshu Srivastava 6 years, 3 months ago

Two type flux magnetic and electric

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Aryan Ruhal 6 years, 3 months ago

Flux related to area how many passed through how much...... May be??

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Ankit Dubey 6 years, 3 months ago

Which flux??

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What is ideal diode

Posted by Anusha Rao 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Deeya Singh 6 years, 3 months ago

An ideal diode is one kind of an electrical component that performs like an ideal conductor when voltage is applied in forward bias and like an ideal insulator when the voltage is applied in reverse bias. So when +ve voltage is applied across the anode toward the cathode, the diode performs forward current immediately. When a voltage is applied in reverse bias, then it performs no current at all. This diode also operates like a switch. When the diode is in forward bias, it works like a closed switch. Whereas, if an ideal diode is in reverse bias, then it works like an open switch.

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A set of n identical resistors, each of resistance R omega, when connected in series have an effective resistance X omega and when the resistors are connected in parallel, their effective resistance is Y omega. Find the relation between R, X and Y.

Posted by Rasmita Sahu 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Saksham Banyal 6 years, 3 months ago

Xomega=nR ........1 Yomega=R/n ...........2 n=R/Y (from eqsn 2) Putting this in eqsn 1 we get XY=R^2

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(1) Which quantity has unit N-s (2) which quantity has unit Pascal-s

Posted by Mukul Kaushik 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Deeya Singh 6 years, 3 months ago

(1) Impulse and Momentum (2) Dynamic Viscosity

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What do you mean by resistors?

Posted by Sejal Uniyal 6 years, 3 months ago

CBSE > Class 12 > Physics

6 answers

Ravi Sinhmar 6 years, 3 months ago

It doesn't prefer to pass electric current easily through it

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Shreyas Neelamahadev 6 years, 3 months ago

Which opposes the flow of current....

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Himanshu Srivastava 6 years, 3 months ago

Padhna chod do physics aukkat nhi tumhare

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Aryan Ruhal 6 years, 3 months ago

Current k flow ko kam karna vala Ex. Fan regulator act as resistor

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Ankit Dubey 6 years, 3 months ago

The obstruction produced by object or any wire which opposed the flow of current or any other thing.

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Golden Rehan 6 years, 3 months ago

Ek Taar hai

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Cbse 12 sample paper solution 2019-2020

Posted by Fatima Ansari 6 years, 3 months ago

CBSE > Class 12 > Physics

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ncert is sufficient for 12 grade

Posted by Paras Sharma 6 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 3 months ago

no according to me ncert is not sufficient. if you want to score 100 % then u have to learn each and everything. and by dying ncert only u can't able to score 100 % so ncert + refresher of ur choice. is best and only way to score gud marks

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Raman Brar 6 years, 3 months ago

According to latest notification cbse syallbus is important not ncrt.

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Anubhav Kumar 6 years, 3 months ago

Yes.

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Electric potential due to a point charge derivation

Posted by Abhishek Soren 6 years, 3 months ago

CBSE > Class 12 > Physics

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What is kinamatics?

Posted by Pawan Kumar 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 3 months ago

Kinematics is a branch of classical mechanics that describes the motion of points, bodies, and systems of bodies without considering the forces that cause them to move. Kinematics, as a field of study, is often referred to as the "geometry of motion" and is occasionally seen as a branch of mathematics.

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What is radial field

Posted by Ayush Patel 6 years, 3 months ago

CBSE > Class 12 > Physics

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What is total internal reflection??

Posted by Aditya Kumar 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Sanskar Ghyar 6 years, 3 months ago

Reflection of light when travelling from denser to lighter medium

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Khushboo Jangir 6 years, 3 months ago

It is that phenomenon in which ray of light travelling from denser to rarer medium strikes the interface at an angle of incidence greater than critical angle and bounce back in the denser medium i.e., reflection happens in place of refraction.

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How can we use diode as rectifier

Posted by Harsh Raj 6 years, 3 months ago

CBSE > Class 12 > Physics