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

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

Ask Question

Ke×e÷G×mass of electron ×mass of proton What does this ratio signifies Where K=9×10^9 G=6.67×10^-11 e=1.6×10^-19

Posted by Bishal Biswas 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Bishal Biswas 6 years, 4 months ago

But why

0Thank You

Nishu Sahu 6 years, 4 months ago

It is the ratio of electric force and gravitational force between an electron and a proton.

1Thank You

Deepanshi Garg 6 years, 4 months ago

It is unitless and dimensionless

1Thank You

ANSWER

Two conducting charged spheres X and Y are connected by a wire. What is conserved?

Posted by Thilagavathi Murugan 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A small flat search coil of area 5 cm square with 140 closely would-be turns is placed between the plot of a powerful magnet producing a magnetic field 0.09 Tesla and then quickly remove out the field region calculate the magnetic flux through the coil and induced EMF in the coil

Posted by Ariba Azeem 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Differnece between polarised and unpolarised uniform

Posted by Sanjay Singhaniya 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 4 months ago

Polarised light:

1. The vibrations of light (vibrations of the electric vector) are restricted in a particular plane.

2. It is absolutely coherent in nature.

3. In polarized light, electric vector is confined to a plane and magnetic vector H is normal to the plane

Unpolarised light:

1. The vibrations of light (vibrations of the electric vector) occur in many plane i.e., it is not restricted to a particular plane.

2. It is incoherent in nature.

3. In unpolarized light, the plane of vibration of electric vector is continuous.

0Thank You

ANSWER

Prove fe and fg equal

Posted by Sudhir Kumar 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is the effect of speed on the charge and mass of a charged particle?

Posted by Satyaprakash Pradhan 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Adeeb Ahmed 6 years, 4 months ago

No effect

0Thank You

Yogita Ingle 6 years, 4 months ago

The mass of the particle increases with speed of the particle, for lower velocity it is insignificant but if the particle moves near to the speed of light, the relativistic mass of the particle increases. If the rest mass of the particle be mo then mass of the particle at a speed v is given by:

3Thank You

Rahul Yadav 6 years, 4 months ago

Speed is directly propotional to the mass. And charge. Remain same with increase of speed

1Thank You

ANSWER

A large insulated sphere of radius r charged with Q units of electricity is placed in contact with a small insulated uncharged sphere of radius r'and it's then separated .The charge on the smaller sphere will now be ......

Posted by Rajat Solanki 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What happens when cell is replaced by galvanometer at balancing point in meter bridge?

Posted by Jasvir Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The radius of curvature of a double convex lens is 15 cm and 30 cm its refractive index is 1.5 calculate its focal length?

Posted by Divyansh Mishra 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How is amplified modulation

Posted by Bharat Rajput 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 4 months ago

Amplitude Modulation is an electronic communication systems technique wherein the base band signal is superimposed with the amplitude of the carrier wave i.e the amplitude of the carrier wave is varying with proportion to the base waveform being transmitted.

1Thank You

ANSWER

Two charges of magnitude -2Q and +Q are located at the points(a,0) and (4a,0) respectively. what is the electric flux due to these charges through the sphere of radius 3a with its centre at the origin????

Posted by Arushi Gupta 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Prerna Pal 6 years, 4 months ago

-2q/€

0Thank You

Pragati Gola 6 years, 4 months ago

Q/€°

0Thank You

ANSWER

what is the net flux of the uniform electric field through a cube of side 20cm oriented so that its faces are parallel to the coordinate planes?????????

Posted by Arushi Gupta 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is the effect of motion on charge q and a mass m of an electron moving with a speed of 10000 m/s

Posted by Yadav A 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

(a) Derive an expression for the electric field E due to a dipole of length "2a' at a point distant r from the center of the dipole on the axial line. (b) Draw a graph of E versus r for r >> a. (c) If this dipole were kept in a uniform external electric field ??, diagrammatically represent the position of the dipole in stable and unstable equilibrium and write the expressions for the torque acting on the dipole in both the cases.

Posted by Arvind Sahu 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Draw colour coding of carbin resistors

Posted by Abhay Shukla 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Arun Grewal 6 years, 4 months ago

I will not be able to make you understand the meaning but it is as follows; Black 0 Brown 1 Red 2 Orange 3 Yellow 4 Green 5 Blue 6 Violet 7 Gray 8 White 9 There are four rings in total of which the first 2 give the first 2 sigmificant numbers. Third one gives the multiplies,i.e, 10 raised to power something. 4th gives accuracy or tolerance in percsntage.

1Thank You

ANSWER

Electric potential of earth is zero ❓..with appropriate reason...

Posted by Rajkanta Soibam 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 4 months ago

Earth is a good conductor of very large size.When some small charge is given to earth,its potential does not change. Hence potential of earth is assumed to be zero.It is like sea level being taken as zero level for measuring all heights.

3Thank You

ANSWER

Krichoffs rule

Posted by Rama Kant 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Arun Grewal 6 years, 4 months ago

It has 2 rules. First is KIRCHOFF CURRENT RULE,IT says that total current entering a junction is equal to total current leaving it. Kirchoff voltage fule states that total potential drops in a circuit OR THE SUM OF TOTAL POTENTIAL DIFFERENCE in a LOOP(not a circuit) is zero.

0Thank You

ANSWER

Define electric dipole movement.Is it scalar or vector

Posted by Chinthem Sitlhou 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Bhagwan Prasad Sah 6 years, 4 months ago

Strength of dipole is called dipole moment. It is vector quantity

2Thank You

Pankaj Kumar 6 years, 4 months ago

It's not movement it's moment. Electric dipole moment is defined as the product of either charge among 2 charge and the distance b/w them P= q2l It's a vector becz it's direction is from - charge to + charge

3Thank You

ANSWER

Using the concept of drift velocity of charge carriers in a conductor deduce the relationship between current density and resistivity of the conductor

Posted by Maahi Verma 4 years, 8 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Kirchhoff's ruled

Posted by Naresh Rana 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Arun Grewal 6 years, 4 months ago

No, not the sum of potential at a point,but IN A LOOP is zero

0Thank You

Veerpal Kaur 6 years, 4 months ago

Kirchhoff had given 2 rules Rule 1.It states that the sum of the electric current meeting at a junction is equal to zero Rule 2. It stated that the sum of potential at a point is also equals to zero

1Thank You

ANSWER

Newton says every action has equal reactions then body should remains in equilibrium due to thesi moment of object will not possible?

Posted by Ranjeet Karande 6 years, 4 months ago

CBSE > Class 12 > Physics