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

The mass of electron is small and a small increase in energy of the electron makes the electrons move with a very high speed. As a result of it, the electrons go quickly out of step with oscillating electric field.

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Muskaan Vig 6 years ago

Because their mass is less and will get accelerated to large velocity in cyclotron..this will throw them out of "resonance frequency" ....

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ANSWER

Principle of parallel plate capacitor

Posted by Samarth M 6 years ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 6 years ago

We know that we can give a certain amount of charge to a plate. If we supply more charge, the potential increases and it could lead to a leakage in the charge. If we get another plate and place it next to this positively charged plate, then negative charge flows towards the side of this plate which is closer to the positively charged plate.

As both the plates have charges, the negative charge on plate 2 will reduce the potential difference on plate 1. On the other hand, the positive charge on plate 2 will increase the potential difference on plate 1. But the negative charge on plate 2 will have more impact. So, more charge can be given on plate 1. Because of the negative charges on plate 2 the potential difference will be less. This is the principle of the parallel plate capacitor.

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Ritwik Choudhary 6 years ago

I guess.......A capacitor works on the principle that the capacitance of a conductor increase appreciably when an earthed conductor is brought near it. Thus a capacitor has two plates separated by a distance having equal and opposite charges.

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ANSWER

Definitions of infrared light

Posted by Aditya Anand 6 years ago

CBSE > Class 12 > Physics

1 answers

Ritwik Choudhary 6 years ago

A region of the electromagnetic spectrum that has slightly longer wavelengths and lower frequencies than visible light, but is not visible to the human eye.

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ANSWER

Definition of infrared light

Posted by Aditya Anand 6 years ago

CBSE > Class 12 > Physics

1 answers

Shubrat Kumar 6 years ago

IR Wave commonly known as Heat waves, as they are also generated from oceans due to resonance of water molecules at resonant frequency, these can used for electronicically operated devices such as TV remotes.

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ANSWER

Best way to do physics? (Beacuse many students like me fear of physics)

Posted by Samarth M 6 years ago

CBSE > Class 12 > Physics

4 answers

Shubrat Kumar 6 years ago

Hc Verma Kitab

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Adi Kumar 6 years ago

Learn all theory and derivations Leave numerical s

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Ritwik Choudhary 6 years ago

First made all the concepts clear

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Amir Suhail 6 years ago

Daily practise and deeply self study is help in do best in physics

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ANSWER

Is hysenberg uncertainty principle is included in board 12 class

Posted by Ankita Khatri 6 years ago

CBSE > Class 12 > Physics

2 answers

Shubrat Kumar 6 years ago

Nope

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Prateek Rathore 6 years ago

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ANSWER

Only physics NCERT numerical is enough for board examination.

Posted by Harsh Kumar 6 years ago

CBSE > Class 12 > Physics

4 answers

Shubrat Kumar 6 years ago

Solve PYQ only

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Jasmeen Kaur 6 years ago

No. I think doing solved pradeep numericals are more better and chances of their coming is more.

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Vanya Singh 6 years ago

Previous sample paper most

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Meghna Sharma 6 years ago

Yeah, it is By that u can clear all ur concepts

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ANSWER

Hey plz some one help...where i can find free best sample papers for cbse board 2020

Posted by Lakshya Gupta 6 years ago

CBSE > Class 12 > Physics

3 answers

Shubrat Kumar 6 years ago

Telegram groups

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Vanya Singh 6 years ago

Arihant

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Divyanshu Gupta 6 years ago

in arihant book

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ANSWER

Kya practicals mai kese ko fail karte hai

Posted by Mahira Sharma 6 years ago

CBSE > Class 12 > Physics

4 answers

Vanya Singh 6 years ago

O hello apni chinta kro ok mera best gya h

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Râhūl ;-),?? 6 years ago

Terko krenge,??

2Thank You

Vanya Singh 6 years ago

Nope yr

1Thank You

Amir Suhail 6 years ago

Nooo

3Thank You

ANSWER

Why is sucrose called invert sugar

Posted by Gunjan Singh 6 years ago

CBSE > Class 12 > Physics

2 answers

Samarth M 6 years ago

Surcose is dextro rotatory but after hydrolysis it becomes laevorotatory. That's why it is regarded aa invert sugar. Sucrose (dextro) ---Hydrolysis---> Glucose (dextro +52.5°) + Fructose (Laevo -92.4°) So, overall laevo

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Vanya Singh 6 years ago

Becoz angle of plane plorisesd light rotate from positive to negative due to presence of isomer

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ANSWER

why potential is taken 0 at infinity?

Posted by Nagendra Kumar Yadav 6 years ago

CBSE > Class 12 > Physics

2 answers

Shubrat Kumar 6 years ago

As potential of bounded system is negative

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Vasu Garg 6 years ago

Because potential is inversely proportional to radius (distance b/w charges). Thus E is proportional to 1 by infinity which can be written zero.

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ANSWER

A bar magnet falls through a metal ring will its acceleration be equal to g

Posted by Sanya Gondi 6 years ago

CBSE > Class 12 > Physics

2 answers

Ankita Khatri 6 years ago

No the acceleration is less than g

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Sagar Bagle 6 years ago

yes b.coz we have considered the magnetic field of earth small

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ANSWER

In em waves we have to do only characteristics of rays ? Or anyother thing?

Posted by Archit Nangla 6 years ago

CBSE > Class 12 > Physics

1 answers

Shubrat Kumar 6 years ago

Plus Basic understanding of propagation of wave and basic equation of EMW

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ANSWER

Why GaAs is preferred for making LED than that of Si?

Posted by Harsukhpal Singh 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is physics??

Posted by Benzene Sulphonate 6 years ago

CBSE > Class 12 > Physics

5 answers

Shubrat Kumar 6 years ago

Hc Verma

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Nagendra Kumar Yadav 6 years ago

study of physical phenomena is called physic.

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Meghna Sharma 6 years ago

The*

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Meghna Sharma 6 years ago

Physics is a branch of science which deals with rhe study of nature and its natural phenomenon.

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Archit Nangla 6 years ago

Which u are studying

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ANSWER

Show that the cyclotron frequency is independent of velocity or energy of the particle

Posted by Shivam Singh 6 years ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years ago

The force acting on a particle with charge q moving with velocity v in magnetic field B is
F=qvB
Due to this force, the particle moves in a circle of radius r.
Thus, we have

<div>Thus, from the above equation, we can conclude that the frequency of revolution is independent of velocity or energy of the particle.</div> <div>It only depends on the charge and mass of the particle and the strength of magnetic field.</div>

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ANSWER

which of the two ,capacitor or inductor, tends to become short circuit when the frequency of the alternating voltage has a very high value

Posted by Sparsh Gupta 6 years ago

CBSE > Class 12 > Physics

2 answers

Yogita Ingle 6 years ago

Capacitor.
Capacitors act like a short at high frequencies and an open at low frequencies. At high frequencies, the capacitor only has time to get a very little charge on it i.e. it has very little counter voltage. At low frequencies, there is sufficient time for a considerable amount of charge to collect on the capacitor. It indicates that there is a large reverse voltage on the capacitor. Therefore the sum of the voltage of capacitor and the voltage of the ac source is nearly zero. That means the current will be nearly zero.

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Dev Yadav 6 years ago

Answer is capacitor Because in capacitor current is ahead to voltage

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ANSWER

Homewtk

Posted by Kittu Maheshwari 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A test charge q is moved without acceleration from A to C along the path from A to B and then from B to C in electric field E as shown in the figure. (i) Calculate the potential difference between A andC. (ii) At which point (of the two) is the electric potential more and why?

Posted by Ritik Prasant 6 years ago

CBSE > Class 12 > Physics

1 answers

Nagendra Kumar Yadav 6 years ago

Vc-Va

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ANSWER

In which principal cyclotron work

Posted by Kishan Singh 6 years ago

CBSE > Class 12 > Physics

6 answers

Nagendra Kumar Yadav 6 years ago

it works on the principle of crossed electric & magnetic fields

0Thank You

Shivam Tiwari 6 years ago

Cyclotron: It is based on the principle of Lorentz force.

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Dev Yadav 6 years ago

When a charged particle placed in magnetic field and alternating electric field It experience force

2Thank You

Ashutosh Choudhary 6 years ago

The repeated motion of charged particel under electric and magnetic field which accelerates charge particel . Electric field provides energy and magnetic provide direction.

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Genius Girl 6 years ago

Cyclotron works on the principle that a charged particle moving normal to a magnetic field experiences magnetic lorentz force due to which the particle moves in a circular path.

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Yoo Yoo 6 years ago

i dont knw

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ANSWER

Lc oscillations qualitative treatment only

Posted by Ankita Khatri 6 years ago

CBSE > Class 12 > Physics