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

The Seebeck effect is a phenomenon in which a temperature difference between two dissimilar electrical conductors or semiconductors produces a voltage difference between the two substances.

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What are three conditions at which we get maximum current?

Posted by Rahul Roushan 6 years, 1 month ago

CBSE > Class 12 > Physics

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Robot Charan 6 years, 1 month ago

Maximum voltage and minimum resistance

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Internal resistance of wire depends upon.?

Posted by Rahul Roushan 6 years, 1 month ago

CBSE > Class 12 > Physics

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Yogita Ingle 6 years, 1 month ago

i) Larger the separation between the electrodes of the cell, more the length of the electrolyte through which current has to flow and consequently a higher value of internal resistance
ii) Greater the conductivity of the electrolyte, lesser is the internal resistance of the cell. i.e. internal resistance depends on the nature of the electrolyte.
iii) The internal resistance of a cell is inversely proportional to the common area of the electrodes dipping in the electrolyte.
iv) The internal resistance of a cell depends on the nature of the electrodes.RE rI IE = V + v= IR + Ir= I (R + r) I = E / (R + r) This relation is called circuit equation. V

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Why series connection is done?

Posted by Rahul Roushan 6 years, 1 month ago

CBSE > Class 12 > Physics

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What is current density? Also derive the formula of Current density in terms of electric field.

Posted by Rahul Roushan 6 years, 1 month ago

CBSE > Class 12 > Physics

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Yogita Ingle 6 years, 1 month ago

The amount of electric current travelling per unit cross-section area is called as current density and expressed in amperes per square meter. More the current in a conductor, higher will be the current density. However, the current density alters in different parts of an electrical conductor and the effect takes place with alternating currents at higher frequencies.

Electric current always creates a magnetic field. Stronger the current, more intense is the magnetic field. Varying AC or DC creates an electromagnetic field and this is the principle based on which signal propagation takes place.

The formula for Current Density is given as,

J = I / A

Where,

I = current flowing through the conductor in Amperes

A = cross sectional area in m2.

Current density is expressed in A/m2.

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What is electric field in Infinite cyclinder with uniform volume charge density using guass law??

Posted by Shefu ??????? 6 years, 1 month ago

CBSE > Class 12 > Physics

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Is Junction transistor,Digital electronics and logic gates, Integrated circuit from chapter Semiconductor not coming in board exams?

Posted by Anya Prakash 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Rishabh Gupta 6 years, 1 month ago

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Viva questions on current electricity

Posted by Shibila Balan 6 years, 1 month ago

CBSE > Class 12 > Physics

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The magnetic susceptibility of a material is negative.The material is---

Posted by Moni Sheoran@2#3% 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Ritwik Choudhary 6 years, 1 month ago

Diamagnetic

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Rajat Barwar 6 years, 1 month ago

I think it should be diamagnetic...

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How intensity of scattered light depend on wavelength??

Posted by Moni Sheoran@2#3% 6 years, 1 month ago

CBSE > Class 12 > Physics

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Yogita Ingle 6 years, 1 month ago

Shorter wavelength and high frequency scatter more due to the waviness of the line and its intersection with a particle. The wavier the line, more are the chances of it intersecting with a particle. On the other hand, longer wavelength have low frequency and they are straighter and chances of colliding with the particle is less so the chances are less.

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What will happen if the were not uniform?

Posted by Rohit Gurjar 6 years, 1 month ago

CBSE > Class 12 > Physics

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If the metallic conductor shown in

Posted by Swati Sharma 6 years, 1 month ago

CBSE > Class 12 > Physics

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How is drift velocity in a conductor affected with the rise in temperature? I think that it decreases but in a book containing questions from previous years it is given that it increases so i just want to clear this ambiguity....

Posted by Naruto Uzumaki 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Chandrasekharan Ramakrishnan 6 years, 1 month ago

But for an electrolytic cell, with rise in temperature, the viscosity of the electrolyte decreases and thus lesser collisions implies that the drift velocity increases

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Yuvraj Singh 6 years, 1 month ago

When temperature is increased then the collisions occur rapidly and the relaxation time is decreased and drift velocity is also decreased Drift velocity is directly proportional to relaxation time .

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Electric dipole momentum

Posted by Yashwant Dewangan 6 years, 1 month ago

CBSE > Class 12 > Physics

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Yogita Ingle 6 years, 1 month ago

The electric dipole moment is a vector quantity; it has a defined direction which is from the negative charge to the positive charge. Though, it is important to remember that this convention of direction is only followed in Physics. In Chemistry, the convention is taken to be opposite i.e. from positive to negative. The line along the direction of an electric dipole is called the axis of the dipole.

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Plot graph showing cirrent versus voltage for the material gaas

Posted by Tanish Jain 6 years, 1 month ago

CBSE > Class 12 > Physics

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Electrical conductivity in terms of charge,mass number,density and relaxation time

Posted by Khushi Singh 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Naruto Uzumaki 6 years, 1 month ago

Conductivity = n × e × e × t / m Where n = no density of electrons e = charge on electron m = mass of electron t = relaxation time

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Is it enough for getting 95 in physics and chemistry

Posted by Vibha Shukla 6 years, 1 month ago

CBSE > Class 12 > Physics

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How..to.prepare chapter ray optics and wave optics??

Posted by Mannat Kaur Khalsa? 6 years, 1 month ago

CBSE > Class 12 > Physics

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Rohan Řąjpůť 6 years, 1 month ago

it's one of the interesting chapter of physics.. so ncert is not sufficient for it try to understand this chapter from SL Arora it will be convenient.. do each derivation.. do numerical from Ray and conceptual question from wave after that solve ncert example question and back side question from both the chapters.

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Which book is prefer to get passing marks in board exam physics?

Posted by Gargee K 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Aadi Ahluwalia 6 years, 1 month ago

Tem year questions

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Ashirvad Patel 6 years, 1 month ago

Ncert

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Which book ki prefer to get passing marks in physics??

Posted by Gargee K 6 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Chandrasekharan Ramakrishnan 6 years, 1 month ago

S.L.Arora

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Nandini Sharma 6 years, 1 month ago

Ncert

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Aadi Ahluwalia 6 years, 1 month ago

Go through ten year questions you will get minimum 40 out of 70

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Derive the relation between electric field and potential..

Posted by Bhuwan Pant 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Shefu ??????? 6 years, 1 month ago

V2-V1=integration E. ds vector

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Rajat Barwar 6 years, 1 month ago

Sorry friend it is a bit lenthy to write here, The final relation is E= -(dV/dr). but this relation is valid for one direction of both.... i.e. if we do the derivative of V in x direction then we will get the E of x dirn. Hope it may help you..

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