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Lesson Posted on 06 Apr CBSE/Class 12/Science/Physics

CBSE 2018

Rajan Mittal Classes

Mittal Classes started on 2010 , we have experience teachers. We provides IIT JEE Coaching classes , BTech Tuition .

<iframe width="560" height="315" src="https://www.youtube.com/embed/LpzPzrvlLYE" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe> read more
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Lesson Posted on 04 Apr CBSE/Class 12/Science/Physics

Tension in a String!

Vishesh Nigam

I am a Chemical Engineer and Khan Academy Talent Hunt Finalist (2017)(please watch my winning video below...

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Asked on 03 Apr CBSE/Class 12/Science

Sir/madam, I am a student of class 12th science stream. I am studying in a CBSE affiliated school here... read more

Sir/madam, 

I am a student of class 12th science stream. I am studying in a CBSE affiliated school here in GIDC, Ankleshwar. I go for many other classes as well in my weekdays and I am always free on weekends. I am searching for private tutions or institues for coaching for physics, chemistry and maths as soon as possible.

My only concern is that I want these classes to be either on weekends or on alternate weekdays. Please guide me ASAP.

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Answered on 07 Jan CBSE/Class 12/Science/Physics Tuition/Class XI-XII Tuition (PUC)

Akash Pandey

Physics Tutor

Expressions for the electric and magnetic fields in free space contain the electric permittivity ε0 and magnetic permeability μ0 of free space. These two quantities are not independent but are related to "c", the speed of light and other electromagnetic waves. The magnetic constant μ0 =... read more

Expressions for the electric and magnetic fields in free space contain the electric permittivity ε0 and magnetic permeability μ0 of free space. These two quantities are not independent but are related to "c", the speed of light and other electromagnetic waves. The magnetic constant μ0 = 4π x 10-7 T m/A is called the permeability of space. The permeabilities of most materials are very close to μ0 since most materials will be classified as either paramagnetic or diamagnetic. But in ferromagnetic materials the permeability may be very large and it is convenient to characterize the materials by a relative permeability. 
This contains the force unit N for Newton and the unit A is the Ampere, the unit of electric current.

With the magnetic permeability established, the electric permittivity takes the value given by the relationship

c = 1/sqrt(ε0μ0)

where the speed of light is given by

c=2.99792458 x 10^8 m/s (exact)

This gives a value of free space permittivity

ε0 = 8.854187817 x 10^-12 F/m

which in practice is often used in the form

k = 1/4piε0 = 8.987552 X10^9 Nm^2/C^2 = Coulomb's constant

These expressions contain the units F for Farad, the unit of capacitance, and C for Coulomb, the unit of electric charge.

The electric permittivity is connected to the energy stored in an electric field. It is involved in the expression for capacitance because it affects the amount of charge which must be placed on a capacitor to achieve a certain net electric field. In the presence of a polarizable medium, it takes more charge to achieve a given net electric field and the effect of the medium is often stated in terms of a relative permittivity.

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Answered on 05 Feb CBSE/Class 12/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

In the extraction of Al, impure Al2O3 is dissolved in conc. NaOH to form sodium aluminate and leaving... read more
In the extraction of Al, impure Al2O3 is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process? read less

D Mukherjee

Teacher

Bayer Process
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Answered on 02 Feb CBSE/Class 12/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

What happens when ethyl chloride is treated with Na metal in presence of dry ether. Write the equation... read more
What happens when ethyl chloride is treated with Na metal in presence of dry ether. Write the equation involved in the reaction. read less

Sujoy D.

Tutor

This one is a famous named reaction called Wurtz reaction. Sodium metal makes way for the formation of carbanion by taking advantage of the leaving ability chlorine. Once the carbanion is produced, it dimerizes to form butane.
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Answered on 20 Mar CBSE/Class 12/Science/Physics Tuition/Class XI-XII Tuition (PUC)

Derive the Bohr ??s quantisation condition for angular momentum of the orbiting of electron in hydrogen... read more
Derive the Bohrâ??s quantisation condition for angular momentum of the orbiting of electron in hydrogen atom, using de Broglieâ??s hypothesis. read less

Nitesh Rai

Tutor

In the Bohr model, the wavelength associated with the electron is given by DeBroglie relationship, and the standing wave condition that circumference = whole number of wavelengths. In the hydrogenic case, the number n is the principal quantum number. These can be combined to get an expression for the... read more

In the Bohr model, the wavelength associated with the electron is given by DeBroglie relationship,

and the standing wave condition that circumference = whole number of wavelengths. In the hydrogenic case, the number n is the principal quantum number.

These can be combined to get an expression for the angular momentum of the electron in orbit. 

Thus L is not only conserved, but constrained to discrete values by the quantum number n. This quantization of angular momentum is a crucial result and can be used in determining the Bohr orbit radii and Bohr energies

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Answered on 10 Jan CBSE/Class 12/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

Differentiate between adsorbtion and absorption.

Richa Subhash

Tutor

Adsorption occurs only on the surface of the adsorbing material whereas absorption is a bulk process and occurs in the bulk of the material.
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Answered on 10 Feb CBSE/Class 12/Science/Chemistry Tuition/Class XI-XII Tuition (PUC)

Write the name of two monosaccharides obtained on hydrolysis of lactose sugar.

Sahithi

Chemistry Tutor

The monosaccharides obtained on hydrolysis Of lactose sugar are D-glucose and D-galactose
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