Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Sumanpreet Kaur 6 years, 4 months ago
- 1 answers
Posted by Pubg Pedi 6 years, 4 months ago
- 2 answers
Pubg Pedi 6 years, 4 months ago
Sia ? 6 years, 4 months ago
Zero vector Is vector which has zero magnitude and arbitrary direction. If we multiply any vector with zero result can't be taken as zero, it's should be zero vector, thus here lies the significance of zero vector.
Posted by Abhishek Kumar 6 years, 4 months ago
- 4 answers
Sia ? 6 years, 4 months ago
The siemens (symbolized S) is the Standard International (SI) unit of electrical conductance.
Posted by Mohit Singh Baghel 6 years, 4 months ago
- 2 answers
Posted by T D 6 years, 4 months ago
- 3 answers
Aman Kumar 6 years, 4 months ago
Posted by Hibu Nassung 6 years, 4 months ago
- 2 answers
Sia ? 6 years, 4 months ago
A thin straight conducting wire will be a uniform linear charge distribution. Let q charge be enclosed by the cylindrical surface.
Gauss' law states that electric flux through any closed surface is equal to the net charge enclosed inside the surface divided by permittivity of vacuum.
Linear charge density,
{tex}\lambda = \frac { q } { l }{/tex}
{tex}q = \lambda l{/tex} ....... (i)
By Gauss' theorem,
{tex}\therefore {/tex} Total electric flux through the surface of cylinder
{tex}\phi = \frac { q } { \varepsilon _ { 0 } }{/tex} [Gauss' theorem]
{tex}\therefore \quad \phi = \frac { \lambda l } { \varepsilon _ { 0 } }{/tex} [From Eq. (i)]
Posted by Gracie Lauren 6 years, 4 months ago
- 2 answers
Aman Kumar 6 years, 4 months ago
Posted by Musaraf Rahman 6 years, 4 months ago
- 1 answers
Sia ? 6 years, 4 months ago
Case I: Given, real depth = 12.5 cm apparent depth = 9.4 cm
As, {tex}\mu = \frac{{real\;depth}}{{apparent\;depth}}{/tex}
or {tex}\mu = \frac{{12.5}}{{9.4}} = 1.33{/tex}
Case II : {tex}\mu = 1.63{/tex} real depth = 12.5 cm
Apparent depth {tex} = \frac{{\operatorname{Re} al\;depth}}{\mu }{/tex}
{tex}A.D. = \frac{{12.5}}{{1.63}} = 7.67cm{/tex}
Distance through which microscope has to be moved downward.
{tex} = (9.4 - 7.67)cm = 1.73cm{/tex}
Posted by Sona Sharma 6 years, 4 months ago
- 1 answers
Yogita Ingle 6 years, 4 months ago
The photoelectric effect is a phenomenon in which electrons are emitted from matter after the absorption of energy from electromagnetic radiation such as x-rays or visible light.The emitted electrons can be referred to as photoelectrons
Laws of photoelectric emission
- For a given metal and frequency of incident radiation, the rate at which photoelectrons are ejected is directly proportional to the intensity of the incident light.
- For a given metal, there exists a certain minimum frequency of incident radiation below which no photoelectrons can be emitted. This frequency is called the threshold frequency.
- Above the threshold frequency, the maximum kinetic energy of the emitted photoelectron is independent of the intensity of the incident light but depends on the frequency of the incident light.
- The time lag between the incidence of radiation and the emission of a photoelectron is very small, less than 10-9 second.
Posted by Astik Dubey 6 years, 4 months ago
- 3 answers
Deepak Jindal 6 years, 4 months ago
Pratik Vatsa 6 years, 4 months ago
Sia ? 6 years, 4 months ago
Posted by Abhay Tewari 6 years, 4 months ago
- 1 answers
Tripti Rawat 6 years, 4 months ago
If the net force on a charge +q at any corner (say A) is zero, then by symmetry it follows that the net force experienced by the other charges at other corners will also be zero.
Posted by Mukesh Kumar 6 years, 4 months ago
- 2 answers
Pratik Vatsa 6 years, 4 months ago
Yogita Ingle 6 years, 4 months ago
Sign Convention in Applying Kirchhoff's Rules
The emf of a cell is positive when one moves in the direction of increasing potential (i.e., negative pole to positive pole) through the cell and is negative when one moves from positive to negative.
The product of resistance and current, i.e., the IR term, in any arm of the circuit is taken negative if one moves in a closed path, in the same direction of the assumed current; and positive if in the opposite direction.
Posted by Adnan Mian 6 years, 4 months ago
- 2 answers
Pratik Vatsa 6 years, 4 months ago
Sia ? 6 years, 4 months ago
For correction of your name in the 10th or 12th marksheet you have to go to your school principal and tell him/her about your problem then he/she will talk with with board council for the correction of the name and also for reissuing the marksheet.
Posted by Rishita Shishir ?✏ 6 years, 4 months ago
- 3 answers
Pratik Vatsa 6 years, 4 months ago
Deepak Jindal 6 years, 4 months ago
Posted by Rohit Sharma 6 years, 4 months ago
- 0 answers
Posted by Naman Chauhan 6 years, 4 months ago
- 0 answers
Posted by Sooraj Singh 6 years, 4 months ago
- 1 answers
Sia ? 6 years, 4 months ago
Try last year papers for preparation : <a href="https://mycbseguide.com/cbse-question-papers.html">https://mycbseguide.com/cbse-question-papers.html</a>
Posted by Himanshu Arya 6 years, 4 months ago
- 2 answers
Pratik Vatsa 6 years, 4 months ago
Roshmita Barik 6 years, 4 months ago
Posted by Ajay Gauwali 6 years, 4 months ago
- 0 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Sia ? 6 years, 4 months ago
Intrinsic semiconductor(without impurity): A pure semiconductor has low concentration of charge carriers. These charge carriers are thermally generated(when the temperature is increased the electrons gain enough energy to become free from the influence of the nucleus). So the conductivity of the material is very less.
Extrinsic case(with impurity): There are two types of charge carriers in semiconductors. They are electrons and holes. If a trivalent impurity is added then the no of holes increases and if a pentavalent impurity is added then the no of electrons will increase. Since conductivity depends on the no of charge carriers per unit volume, the conductivity increases.
0Thank You