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

Loop law is also known as Kirchhoff’s Second Law.
It states that in a closed loop,algebraic sum of Emfsis equal to the algebraic sum of product of resistances and respective currents flowing through them.
Consider a simple circuit havingEmfs = E₁and E₂; R₁ and R₂ =resistances; current =I₁ and I₂.
Then according to this law : E₁+E₂=I₁R₁+ I₂R₂

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two charges of magnitude -3 q and + 2 q are located at point( a, 0 )and (4a,0 )respectively what is the electric flux due to these charges through a sphere of radius 5 a with centre at origin. Try to ans. This question pls..

Posted by Priya Dharshini ? 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Vishwajeet Kumar 6 years, 5 months ago

U welcome

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Priya Dharshini ? 6 years, 5 months ago

May be simple. I just completed 11th class trying to complete ch- 1 on my own so i did get my answer matched... any how thanks a lot it will be v.helpful for me..?

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Vishwajeet Kumar 6 years, 5 months ago

Simply use gauss's law - Electric flux inside a closed surface is q/ epsilon not . Here total charge is -q. So electric flux is -q/epsilon not. Its so simple.

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In physics and chemistry cbse 12th board exam 2019-20, are first 20 one mark questions are mcq or one word anwer?

Posted by Amit Kumar 6 years, 5 months ago

CBSE > Class 12 > Physics

2 answers

Hritik Kumar 6 years, 5 months ago

Yts its true nhai

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Priya Dharshini ? 6 years, 5 months ago

It is mcq... i think so..... it was informed like this in our school

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Find the force on 3micro coulomb charge of given system of charges and also find the force between 2micro coulomb and 3 micro coulomb?

Posted by Ayush Kaushik 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Vishwajeet Kumar 6 years, 5 months ago

System of charges ka image dekhe bina solve nahi kar sakte☺

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Best book to solve numericals except NCERT for boards as well as entarance??

Posted by Sunil Auti 6 years, 5 months ago

CBSE > Class 12 > Physics

3 answers

Hritik Kumar 6 years, 5 months ago

You should take pradeep book

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Mr Lovely 6 years, 5 months ago

Allen study material

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Kunnal Singh 6 years, 5 months ago

Arihant material

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Best book for numerical only for cbse board exam except ncert

Posted by Riya Sinha 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Kunnal Singh 6 years, 5 months ago

Rd Sharma for maths Arihant material for physics and chemistry

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What is TIR?

Posted by Nitish Yadav 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Tarun Jakhar 6 years, 5 months ago

the complete reflection of a light ray reaching an interface with a less dense medium when the angle of incidence exceeds the critical angle.

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can u tell how the values of flux according to gauss theorem when placed at the corner of the cube is q/8epsilon not?

Posted by Krutika Guru 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Vishwajeet Kumar 6 years, 5 months ago

Because there are 8 corners of a cube. And total charge is q/epsilon not. So at one corner charge is equal to q/8 epsilon not.

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Determine the total charge on 75 kg of electron

Posted by Astrohareram Vats 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Vishwajeet Kumar 6 years, 5 months ago

Use the mass of an electron and charge on an electron to solve this question.

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What is refraction and its laws

Posted by Uday Mann 6 years, 5 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 5 months ago

Refraction is due to change in the speed of light as it enters from one transparent medium to another.
Experiments show that refraction of light occurs according to certain laws.
So Laws of refraction of light are
The incident ray, the refracted ray and the normal to the interface of two transparent media at the point of incidence, all lie in the same plane.
The ratio of sine of angle of incidence to the sine of angle of refraction is a constant, for the light of a given color and for the given pair of media. This law is also known as Snell's law of refraction.
If i is the angle of incidence and r is the angle of refraction then sini/sinr=constant=n .....(1)
This constant value is called the refractive index of the second medium with respect to the first.

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Is the two units optics and communication system are cancelled out from the syllabus of session 2019 -2020?

Posted by Saini Simran 6 years, 5 months ago

CBSE > Class 12 > Physics