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➡️Rt1=R1(1+α1t)Rt1=R1(1+α1t) ➡️ Rt2=R2(1+α2t) ➡️ Req.=Rt1+Rt2 ➡️ Req=R1+R2+(R1α1+R2α2)t ➡️ Req=(R1+R2){1+(R1α1+R2α2/R1+R2).t} ➡️ α(eff) =R1α1+R2α2/R1+R2

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If the value of q1q2 divided by r square is 9 into 10 to the power 9

Posted by Anjali Jha 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How does the conductance of semi conducting material change with rise in temperature?

Posted by Prakriti Rao 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

K@Łp@N@ $Øđh!?? 6 years, 3 months ago

Because with Increase in temperature the electrons overcome the energy barrier between the valence band and conduction band easily

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What are nucleons

Posted by Monica Gowda 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 3 months ago

Nucleons are the subatomic particles. Present in the nucleus of an atom. Protons and Neutrons are called nucleons. because they are present inside the nucleus.

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What is the relationship in between electric intensity and flux

Posted by Gur Preet 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Sukhdeep Singh 6 years, 3 months ago

It can be written from the defination of electric flux as E=flux/area( direction for area held parallel to E field i.e normal of area parallel to field). This is why it is sometimes called flux density and means flux passing through a unit area..

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Why the glass rod has negative charge when rubbed with silk cloth?

Posted by Prashant Yadav 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Manika Gupta 6 years, 3 months ago

It is by convention....

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Nishu Sahu 6 years, 3 months ago

When glass rod rubbed with sikl cloth it aquires positive charge not negative charge and this is because electron from glass rod transfer to the silk cloth .

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How does the drift velocity of electron in a metallic conductor vary with inc. In temp.

Posted by Utkarsh Srivastav 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Tushar Kumar 6 years, 3 months ago

Bcz on increasing the temperature, electrons comes in random motion and suffers a great collisions which varies the drift velocity

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What is the electric field for infinitely long rod ???????

Posted by Dr. Sunaina Arora 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Aman Kumar 6 years, 3 months ago

Electric field = lambda/ 2πr€ not

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A galvanometer has a resistance 30ohm and gives full sale deflection for a current of 20MA.How much resistance and in what way must be connected to convert into 1.an ammeterof range 0.3A and a voltmeter of range 0.2V

Posted by Kunal Singh 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Aman Kumar 6 years, 3 months ago

Ohk...Your 1st answer is :- Rs=0.002 ohm and 2nd answer is :- R= 10^4 = 10× 10^3 = 10 K ohm.. ?hope this helps

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Ranjeeet Singh 6 years, 3 months ago

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Electric current is which quantity except scaler

Posted by Rahul Dagar 6 years, 3 months ago

CBSE > Class 12 > Physics

4 answers

Jaya Mehta 6 years, 3 months ago

Tensor

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Dr. Sunaina Arora 6 years, 3 months ago

Who cares

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Aman Kumar 6 years, 3 months ago

Ya Tensor

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Aman Yadav 6 years, 3 months ago

TENSOR

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Is questions related to centre of mass & collision comes in jee examination ??

Posted by Rishita Shishir ?✏ 6 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Manika Gupta 6 years, 3 months ago

Yesss

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Rishita Shishir ?✏ 6 years, 3 months ago

Thanks a lot

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Adwitha Nair???‍??‍? 6 years, 3 months ago

Yes

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A dipole inclosed in a cube of side 1cm what electric flux thought cube

Posted by Akhil Rock 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Tushar Kumar 6 years, 3 months ago

In cube where it is

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Sudarshan Sharma 6 years, 3 months ago

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Why test charge is always positive

Posted by Nasima Khan 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Tushar Kumar 6 years, 3 months ago

Bcz of greater potential

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K@Łp@N@ $Øđh!?? 6 years, 3 months ago

We take always positive charge as a test charge because positive charge is higher potential and negative charge is lower potential therefore influence of positive charge on other charges is greater than negative charges.

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Using kirchoff law calculare current through 40 and 20 ohm resistor.This is the last year 2019 question.

Posted by Yash Sharma 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Gauss theorem derivation

Posted by Parminder Saini 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

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Explain superposition principle.

Posted by Rishita Shishir ?✏ 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Rishita Shishir ?✏ 6 years, 3 months ago

Thanks

1Thank You

Yogita Ingle 6 years, 3 months ago

The superposition principle states that for a linear force system, the resultant force acting on a body is equal to the vector sum of all the individual stimulus. In Coulomb’s law the stimulus would be electrostatic force which depends upon the magnitude of charge and the distance between two charges.

The superposition principle is helpful when there are large number of charges in a system.

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For any charge configuration equepotential surface through a point charge is normal to electric field. Justify

Posted by Swati Kumari 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What are flux

Posted by Deepa Bain 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Sukhdeep Singh 6 years, 3 months ago

It is not unit area.. It is through a given area..

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Yogita Ingle 6 years, 3 months ago

Electric Flux is defined as a number of electric field lines, passing per unit area. It is another physical quantity to measure the strength of electric field and frame the basics of electrostatics. It is also defined as the product of electric field and surface area projected in a direction perpendicular to the electric field.

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Do additional exercise questions of physics come in board exams?

Posted by Tanvi Malhotra 6 years, 3 months ago

CBSE > Class 12 > Physics

3 answers

Manika Gupta 6 years, 3 months ago

Noo only ncert examples and exercise come ..... Additional exercise does not come

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Harry Potter 6 years, 3 months ago

ya, it is an important excercise

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∂Αяѕнαиαα ყα∂Αѵ ??? 6 years, 3 months ago

only selected one. all questions are not from cbse examination point of view.

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Why charge dustribute among capacitors in parallal connection

Posted by Tuna Naik 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Tapan Pandey?? 6 years, 3 months ago

All the energy are consumed in it so, the amount of energy is generated is maximum

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Tapan Pandey?? 6 years, 3 months ago

Because, in parallel plate capacitor there is no loss of electric line of force

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Explain me drift velocity.

Posted by Priya Yadav 6 years, 3 months ago

CBSE > Class 12 > Physics

5 answers

Nasima Khan 6 years, 3 months ago

Velocity of charged particle between two successive collisions known as drift velocity

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Tapan Pandey?? 6 years, 3 months ago

Aman is right....

1Thank You

Tapan Pandey?? 6 years, 3 months ago

Honey electron doesn't comes into rest

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Honey Singh 6 years, 3 months ago

When electron moves from one point to another point then they collaid each other continuously due to this collision of electron they loss kinetic energy and comes into rest but at that instant potential difference provide the kinetic energy and afain electron get accelerates

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Aman Singh 6 years, 3 months ago

It is a constant average velocity with which electron moves inside the conductor in presence of electric field to opposite direction of electric field

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Electric field due to uniformly charged density of sheet

Posted by Shivanand Gupta 6 years, 3 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Can I just rely on YouTube videos for physics which I am able to understand properly...or should I go to a tutor .

Posted by Priya Sharma 6 years, 3 months ago

CBSE > Class 12 > Physics

6 answers

Priya Sharma 6 years, 3 months ago

Koi naa ...btw thank u

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Aman Kumar 6 years, 3 months ago

Ur and my condition is same priya sharma..?.....chahta toh hu tuition buttt.....

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Priya Dharshini ? 6 years, 3 months ago

Tutor can complete ur portions on time.... by watching videos i dont know... fine u can decide occording to ur time table which one u want to choose..

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Priya Sharma 6 years, 3 months ago

Although I am worrieng about if I don't finish my cource timely ..as wathching videos take time....confused Anyways thanks for replying

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Priya Sharma 6 years, 3 months ago

Yaah I was thinking that only but I am able to understand concepts very easily on YouTube which is not happening with any tutors near me....they too teach good but my concepts gets crystal clear wathching videos

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Priya Dharshini ? 6 years, 3 months ago

In youtube u can just watch the videos u cant express ur doubts and interaction will not be there that much..... if tutor is there u can understand v.well,can ask doubts and u will get good guidance. If ur watching videos daily u cant do that for all subjects for whole day.... disturbance can be more.. this is my personal opinion. U can have a tutor and watch videos in ur leisure time to understand more important things

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Two charges of magnitude 5nc and - 2nc are placed at points (2cm,0,0)and

Posted by Golu Golu 6 years, 3 months ago

CBSE > Class 12 > Physics