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

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

Ask Question

What is boltzman constant.

Posted by Rohit Singh 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Robins Kumar Dinkar 6 years, 11 months ago

The constant no obtained by dividing( universal gas constant) by (avagadro no.) Is called boltzman constant.

1Thank You

ANSWER

Which light waves are used in fog

Posted by Saima Jain 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Varsha Grewal 6 years, 11 months ago

Infrared rays

1Thank You

ANSWER

The red light is used in photographic room ?why?

Posted by Saima Jain 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Boyar Debbarma 6 years, 11 months ago

Because the photo paper is basically light sensitive and even it can destroy the picture. But it is less sensitive to red colour, either u can use green or blue-green as well.

3Thank You

ANSWER

State the Factor on which the Refractive Index of a material medium for a given wavelength depend

Posted by Komal Sharma 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years, 11 months ago

Refractive index(optical properties) of a substance depends upon

1. permittivity and permeability of the substance.

2. the wavelength of the light, for light of lower wavelength higher will be the refractive index.

3. the density of the substance and mainly on the intermolecular force between the molecules of material.

3Thank You

ANSWER

Write the complete reaction of lead acid accumulator.

Posted by Abhishek Yadav 6 years, 11 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

HOw much long a answer be written for 3 and 5 mark questions

Posted by Ashwini Kumar Mohanty 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Saloni Singh 6 years, 11 months ago

see if you are writing bullets point then for 3 marks u can write 3 point and similarly 5 points for 5 marks it will be more easy for you if you write in bullets point

1Thank You

ANSWER

What is the syllabus and marking scheme of physics practical of 12th

Posted by Skand Jha 6 years, 11 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Formula of electric dipole = q2d But in ncert solution ex 1-ques no.-9 Given that p=qd why ?

Posted by Aryan Kumar 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Priya Rajput 6 years, 11 months ago

Simple..tumne distance between two charges 2d liya and book me 1d liye...both are correct

2Thank You

ANSWER

Which transition corresponds to emission of radiation of maximum wavelength?

Posted by Vishu Jain 6 years, 11 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to learn derivations?

Posted by Vishu Jain 6 years, 11 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The resistance decrease in parallel and increase in series. Why ?

Posted by Ritik Patel 6 years, 11 months ago

CBSE > Class 12 > Physics

2 answers

Rounak Gupta 6 years, 11 months ago

in series all current is drawn by the resistance wire. whereas in parallel part of the current is drawn by the wire..

2Thank You

Anna B Varghese 6 years, 11 months ago

in series there is an increase in length of the circuit while in parallel combination there is an increase in area since resistance is a quantuty which is directly prortional to length and inversely prortional to area the resistance decreae in parallel and increase in series

2Thank You

ANSWER

I have project on "LED forward and reverse biasing on three different colors" what topics in it should I keep??

Posted by Sanskruti Srivastava 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Vaibhav Chaubey 6 years, 11 months ago

Rectifiers

4Thank You

ANSWER

Cbse ka physics ka paper 100% ncert se he se aata h kya

Posted by Ankit Singh 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Sachin Rao 6 years, 11 months ago

Not 100%,but at least 80-85%

1Thank You

ANSWER

About practicals

Posted by Ritu Thomas 6 years, 11 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

what is the difference between current electricity

Posted by Dharshika As 4 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 6 months ago

Electricity is the form of energy and produced by the flow of electrons whereas current is combination of flow of charge per unit time. Current is the quantity of the electrical energy. Electricity can refer to static electricity, stationary or moving charges. Current is a general characteristic of electricity, like voltage and resistance.

0Thank You

ANSWER

is van de graff generator for class 12 board exams please tell ch electrostatic potential and capacitance pg.83

Posted by Dharshika As 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Chakshu Sharma 2204 6 years, 11 months ago

Not in CBSE , only in punjab board .

1Thank You

ANSWER

Practical of 12???

Posted by Aman Kumar 6 years, 11 months ago

CBSE > Class 12 > Physics

2 answers

Aman Kumar 6 years, 10 months ago

Physics

0Thank You

Dharshika As 6 years, 11 months ago

which subject?

2Thank You

ANSWER

A wire of length 0.26 m is bent to form a circular loop if 2A of current is flowing through this loop calculate the magnetic field due ti this loop at a point p which is at a distance of 0.15m from its center on its axis

Posted by Thulasi N 6 years, 11 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

A vertical electric field of magnitude 4*100000 N/C just prevents a water droplet of mass 0.0001kg from falling .Find the charge on droplet

Posted by Mannat Gulati 6 years, 11 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

If earth is a capacitor.Where is its other plate?

Posted by Arpit Tiwari 6 years, 11 months ago

CBSE > Class 12 > Physics

2 answers

Sakshi Singh 6 years, 11 months ago

A capacitor is that appliance which holds electric current irrespective of its shape and size?????

1Thank You

H!Mαη$Hμ Ұαδαυ ✔️ 6 years, 11 months ago

It is spherical capacitor

3Thank You

ANSWER

What is meant by resistivity and conductivity of a substance?derive relation.

Posted by Chhavi Das 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 11 months ago

Resistivity is the electrical resistance of a conducting material per unit length. In other words, it is the degree to which a conductor opposes the flow of electricity through itself, instead allowing the energy to flow out of the electrical circuit, most often as heat. Resistivity is useful in comparing various materials based upon their ability to conduct electrical currents. The unit of resistance is the ohm.
Conductivity, by contrast, is the degree to which a conductor allows the flow of electricity through itself. The unit of conductivity is the siemens (S). It was formerly called the mho. Good conductors retain heat, minimizing the loss of energy from the electrical circuit. Copper wires, for example, are a material with excellent conductivity. Materials such as air, cloth, or rubber have very poor conductivity.

5Thank You

ANSWER

Two fixed charges+4Q and +2Q are seperated by the distance x in vaccum where should the third charge q be placed in order to be at equilibrium

Posted by Stanzin Thousum 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Sangitaben Patel 6 years, 11 months ago

7x / 12 from 4Q

0Thank You

ANSWER

What is magnifying power

Posted by Anu Anu 6 years, 11 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 11 months ago

Magnifying power is defined as the angle subtended at the eye by the image to the angle subtended (at the unaided eye) by the object.
m = m_o × m_e = L/F₀× D/F_e
To increase the magnifying power both the objective and eyepiece must have short focal lengths such as
m = L/F₀× D/F_e

3Thank You

ANSWER

Bwester law

Posted by Saleem Khan 6 years, 11 months ago

CBSE > Class 12 > Physics