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

Ask questions which are clear, concise and easy to understand.

Ask Question

Why we can not use receiver as transistor ?

Posted by Geetansh Rastogi 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is thee benefit of studying through CBSE??

Posted by Gaurav Kumar 8 years ago

CBSE > Class 12 > Physics

1 answers

Shivam Tiwari 8 years ago

You select in jee

1Thank You

ANSWER

Define dielectric contant in terms of capacitance

Posted by Anjali Meena 8 years ago

CBSE > Class 12 > Physics

1 answers

Amar Kumar 8 years ago

Dielectric constant is the property of an electrical insulating material (a dielectric) equal to the ratio of the capacitance of a capacitor filled with the given material to the capacitance of an identical capacitor in a vacuum without the dielectric material.

0Thank You

ANSWER

What is Lorentz force

Posted by Abhijeet Tripathi 8 years ago

CBSE > Class 12 > Physics

1 answers

Amar Kumar 8 years ago

Lorentz force is the force exerted on a charged particle q moving with velocity v through an electric E and magnetic field B. The entire electromagnetic force F on the charged particle is called the Lorentz force (after the Dutch physicist Hendrik A. Lorentz) and is given by F = qE + qv × B.

The Lorentz force is the combination of electric and magnetic force on a point charge due to electromagnetic fields. A particle of charge q moving with velocity v in the presence of an electric field E and a magnetic field B experiences a force.

0Thank You

ANSWER

What is capacitance

Posted by Ragini Srivastava 8 years ago

CBSE > Class 12 > Physics

1 answers

Kashifa Aslam 8 years ago

Capacitance of a conductor may be defined as the ratio of charge given to the conductor to the rise in its potential. Electrical capacitance or capacity of a conductor may also be defined as the measure of the ability of a conductor to store electrical charge or energy.

0Thank You

ANSWER

NCRTV sufficient for good marks in 12 class

Posted by Pankaj Rawat 8 years ago

CBSE > Class 12 > Physics

1 answers

Prachi Agarwal 8 years ago

Yes

0Thank You

ANSWER

Given arrangement the max. Value of F for which there is no relative motion between the blocks is

Posted by Neel Khageja 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Magnetic flux

Posted by Pankaj Kumar 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is culumbs law

Posted by Sherjil Jawed 8 years ago

CBSE > Class 12 > Physics

1 answers

Amar Kumar 8 years ago

Coulomb's law states that: The magnitude of the electrostatic force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of charges and inversely proportional to the square of the distance between them. The force is along the straight line joining them.

{tex}F = Ke{{{q_1}{q_2}} \over {{r^2}}}{/tex}

where ke is Coulomb's constant (ke = 8.99×109 N m²C⁻²), q₁and q₂are the signed magnitudes of the charges, and the scalar r is the distance between the charges. The force of interaction between the charges is attractive if the charges have opposite signs (i.e., F is negative) and repulsive if like-signed (i.e., F is positive).

1Thank You

ANSWER

Energy density associated with the electromagnetic wave

Posted by Priyansh Menariya 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How we can us kvl

Posted by Aman Kushwaha 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Calculate columb force btw a proton and electron separated by 0.8× 10*-15

Posted by Harshita Saxena 8 years ago

CBSE > Class 12 > Physics

1 answers

Aman Jaiswal 8 years ago

F=9×10^9×1.6×10^-19×1.6×10^-19/(0.8×10^-15)^2 =36×10^-24 Newton

1Thank You

ANSWER

Oerted experiment

Posted by Sandhya Singh 8 years ago

CBSE > Class 12 > Physics

1 answers

Khushboo Arora 8 years ago

The 4 different groups attached to the carbon atm is known as chiral carbon

1Thank You

ANSWER

An alpha particle of energy 5 Mev is scattered through 180degree by stationary uranium nucleus the order closest distance approach.

Posted by Simranjeet Kaur 8 years ago

CBSE > Class 12 > Physics

1 answers

Himanshu Bisht 8 years ago

Put Z= 235 E= 5Mev angle = 180° Nd solve further in the formula D=2KZe×e/E

1Thank You

ANSWER

What is closest approach

Posted by Aryan Sharma 8 years ago

CBSE > Class 12 > Physics

1 answers

Himanshu Bisht 8 years ago

The closest distance that the @- Particle comes to, before reflecting back is called the distance of closest approach

1Thank You

ANSWER

Logic gate

Posted by Nk Kumar 8 years ago

CBSE > Class 12 > Physics

2 answers

Rohit Bisht 8 years ago

Go throuhh any book or google

0Thank You

Nk Kumar 8 years ago

Answer

2Thank You

ANSWER

Semiconductor

Posted by Devashish Kumar 8 years ago

CBSE > Class 12 > Physics

1 answers

Rohit Bisht 8 years ago

Transistor

0Thank You

ANSWER

What is mesiner effect

Posted by Prashant Singh 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Why a part of light gets reflected back into first medium while rest enter the other in transparent medium

Posted by .Ismat .Jamil 8 years ago

CBSE > Class 12 > Physics

1 answers

Tanuja Biswas 8 years ago

See u can look at objects only when light falls on them , reflects and enters your eye. If it wouldnt have, u would have never seen clear water. It happens so because see every new medium acts as a new plane whether a wall, or cotton or any transparent object. So as light reflects from wall, so it does from a glass but difference is just that light can" Also" pass through transparent medium i.e. show refraction, and along sides of opaque objects it shows diffraction. But this thing cannot happen in one case when one transparent medium is immersed in another medius of exactly same refractive index.

3Thank You

ANSWER

draw the graph showing variation of resistivity with temperature for Silicon

Posted by Abdul Kadir 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is culomb law

Posted by Shashi Pal 8 years ago

CBSE > Class 12 > Physics

2 answers

Kashifa Aslam 8 years ago

Force exerted by any two point charges on each other at rest is directly proportional to the product of the magnitude of two charges and inversely proportional to the square of the distance between them. The force acted along the line joining the two point charges.

2Thank You

Shashi Pal 8 years ago

Like charge repeals to each other whear unlik charge is attract to each other

2Thank You

ANSWER

What is lenz's law.

Posted by Biru Kumar 8 years ago

CBSE > Class 12 > Physics

1 answers

Aman Jha 8 years ago

The direction of induced emf or induced current in a circuit is such that it opposes the cause or the change that produces it.

3Thank You

ANSWER

Two blocks having masses 1kg and 2kg respectively are connected by a string AB of mass 1kg. The blocks are placed on a horizontal smooth horizontal surface. Block of mass 1kg is pulled by a horizontal force F of magnitude 8N. Find tension in string at points A and B.

Posted by Neelesh Sharma 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Which material is used in the core of transformer and why

Posted by Azra Laiq Laiq 8 years ago

CBSE > Class 12 > Physics

2 answers

Rahul Shukla 8 years ago

Soft iron usually as it has properties:- (1) The material should have low retentivity so that it gets demagnetised easily. (2) For the electromagnet to be very strong, it should have a high value of saturation magnetisation. (3) It should have low coercivity . (4) Hysteresis loss should be small. It should not be heated up during magnetisation and demagnetisation. The above-mentioned properties are reasonably met with soft iron and so soft iron is usually preferred for an electromagnet.

1Thank You

Surbhi Yadav 8 years ago

A ferromagnetic substancs for example-Iron is used in the core of transformers

1Thank You

ANSWER

what type of practical can be asked by examiner

Posted by Harman Singh 8 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is Van de Graff generator

Posted by Khan Ahmad 8 years ago

CBSE > Class 12 > Physics

1 answers

Rahul Shukla 8 years ago

It is a device which helps in generation of electricity by collecting charge ( basically static charge collector)

0Thank You

ANSWER

Is wave has dual nature

Posted by Aviral Gupta 8 years ago

CBSE > Class 12 > Physics

2 answers

Bts Dhami 8 years ago

Yes its shows dual nature

0Thank You

Fazil R 8 years ago

Yes it has both dual as well as particle nature

1Thank You

ANSWER

what is science

Posted by Suvarna Koirala 8 years ago

CBSE > Class 12 > Physics

1 answers

Lisa Yadav 8 years ago

We can't explain it but yes this will help us to find our own identity. If you are interested to know science , then see the cosmic shows. I like those shows ☺☺

1Thank You

ANSWER

Electric current is a scalar quantity because it does not follow the law of vector algebra we use vector algebra for RLC CIRCUIT how is this possible?

Posted by Tanishq Jhavery 8 years ago

CBSE > Class 12 > Physics