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

A=+4q , B=-q when we touch third uncharged sphere (say C ) then charge become equal on both , A=C=+4q/2=+2q then C with B , B=C=q/2 , F1(before C)=-4kq²/r² F2(after C) = kq²/r² , F1=-4F2 If sphere C was 1st touch with B and then A charge changes and F2=-7kq²/8r²

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How to study

Posted by Aakanksha Dhumal 7 years, 5 months ago

CBSE > Class 12 > Physics

5 answers

Aj Style 7 years, 5 months ago

Firstly you ask yourself why you want to study than try to concentrate I am sure that you will find the right way to study

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Shreya Verma 7 years, 5 months ago

With concentration

2Thank You

Abhishek Mishra 7 years, 5 months ago

Both hard and smart

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Sahil Srivastav 7 years, 5 months ago

Work smartly

1Thank You

Jin Kazama 7 years, 5 months ago

Work hard

1Thank You

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Why Iron attracts towards magnet and why wood not, as these two are Solids

Posted by Sofi Innu 7 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Puno Syami 7 years, 5 months ago

be'coz wood which is non metal lakes paramagnetism

1Thank You

Jin Kazama 7 years, 5 months ago

It is physics

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Where is gold leaf electroscope

Posted by Harshit Gupta 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Jin Kazama 7 years, 5 months ago

Not in syllabus

1Thank You

ANSWER

Why one should ignore quantisation at macroscopic level

Posted by Neha Gupta 7 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Isha Ahuja 7 years, 5 months ago

In macro the charge become very much large as compared to elementary charge and as discrete nature has no important as charge become continuous in nature

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Shreya Verma 7 years, 5 months ago

At macroscopic level, charge on a body is assumed to be the order of a few micro coulomb (μC) . Hence, Q= 10^-6 C . From quantization of charge, Q= ne => 10^-6 = n* 1.6 * 10^-19 => n = 10^-6/ 1.6*10^-19 => n= 10^13. Since, at macroscopic level the no. of electron or proton becomes too large hence they can never be said quantized.

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How we find magnitude of electrostatics force

Posted by Mohit Saini 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Rishabh Sahu 7 years, 5 months ago

Whatnis troubling you to find out the magnitude of electrostatic force. One just puts the values in formula of coulomb's law .

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1 coulomb

Posted by Ayush Kumar 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Anjali Kumari 7 years, 5 months ago

10^-6 m

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what is colums law

Posted by Ram Prakash Tiwari 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Manisha Maani 7 years, 5 months ago

The force of interaction b/w 2 point charges is directly proportional to product of their points or magnitude & inversely proportional to square of distance b/w them. F= q1q2/ r2 In CGS k=1 In SI k= 1/4πEo

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Calculate the charge of a copper particle of mass 300mg if 0.1% of the electrons are removed from it.

Posted by Vikram Kumar 7 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is permittivity of free space?

Posted by Nishu Raj 7 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Kunal Shah 7 years, 5 months ago

it is denoted by e

0Thank You

Roshani Shaikh 7 years, 5 months ago

It is that when we assume that charge is present in free space.

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An electron and proton are kept in the same field will experience same gorce and same acceleration

Posted by Shivani Kashyap 7 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

what is ray?

Posted by Amreen Bano 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Kunal Shah 7 years, 5 months ago

it is imaginary line that start from one end and go to infinity

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Electronic potential

Posted by Bhanu Pratap Singh 7 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The force between two point charges placed at a separation r is f.find the force between the same charges,if half the space between them in filled with a dielectric constant 4

Posted by Hina Sagar 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Rishav Nanda 7 years, 5 months ago

1/4πEoK (q1*q2)/r² Where k=4

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1-Determine the charge on 75kg of electrons. 2-how many Coulomb of positive charge are present in 2mole of neutral hydrogen gas. 3-charges of +5coulomb,+10coulomb,and -10Coulomb are placed in air at corners a,b,c of an equilateral triangle having each sides is equal to 5cm . determine the resultant force at charge A 4-consider the charges q,+q,-qis

Posted by Vishal Kanwal 7 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Hina Sagar 7 years, 5 months ago

Bhai shayad h answer ek br answer check kr lena

2Thank You

Hina Sagar 7 years, 5 months ago

Ans 3 -18root 5 N

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An open pipe of length l1 and a closed pipe of length l2 both resonate with the same tuning fork in their fundamental mode of vibration. Calculate the value of l1/l2.

Posted by Pramod Thakur 7 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Are practicals also available on this app??

Posted by Nandni Aggarwal 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Rishabh Sahu 7 years, 5 months ago

No only practical syllabus is available.

1Thank You

ANSWER

What is electric charge its the flow of electron with a high and definete speed.. Then why do we get shock when we come in contact with it A-Becz of we are attracted towards it i mean we are positively charged. Can anyone help me with the l Problem.

Posted by Shubh Mishra 7 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Diople electric

Posted by Vinay Kumar 7 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Aj Style 7 years, 5 months ago

When 2 equal and opposite charges are seperated by a distance than this arrangement is said to be electric dipole

0Thank You

Tazeem Khan 7 years, 5 months ago

the arrangement of equal and opposite charges at small distance is called electric dipole

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ANSWER

Sl Arora example no 24

Posted by Punita Kumari 7 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Define stefan`s law of radition

Posted by Shivam Kumar 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Rishabh Sahu 7 years, 5 months ago

Total thermal energy radiated per unit time by a body dQ / dt =σ AT^4 for a black body and e σ AT^4 for body other than a black body . σ is Stefan's constant , A is area T is temperature of the body.

1Thank You

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How and why and where the charge in a body generated

Posted by Arun Yadav 7 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Noothan Gowda 7 years, 5 months ago

In nucleic by nature from neutrons into electrons and protons

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Why quantanisation is ignore in vase of macroscopic charge

Posted by Rashid Khan 7 years, 5 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why we study?

Posted by Ritik Kushwaha 7 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Rishabh Sahu 7 years, 5 months ago

Because ,we are told to , we have to give an exam of our old education system, because we have to run behind degrees given by institutions and maybe more useless reasons. Perhaps few people study for research , field of interest , to gain expertise in a path or profession.

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Medhavi Singh 7 years, 5 months ago

Why you breath?? Study is essential part of our life...

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