Ignite coaching classes

11/02/2024

https://www.youtube.com/watch?v=zrAqQ6NQnFk

This video explains about right hand thumb rule to identify direction of magnetic filed and magnetic field in center of a circular loop.

18/11/2023

https://youtu.be/4hbkSYGPiAU

This video explains resistancers in series with experimwent.

30/10/2020

White plywood at the rate of 30 RS per square ft. Market rate 45 RS per square ft.

20/11/2019

https://youtu.be/Iuv6hY6zsd0

Light is so common that we rarely think about what it really is. But just over two hundred years ago, a groundbreaking experiment answered the question that ...

04/05/2019

P-N junction diode characteristics :-
===========================
Before we can use the PN junction as a practical device we need to firstly bias the junction.
ie connect a voltage potential across it. On the voltage axis.
“Reverse Bias” refers to an external voltage potential which increases the potential barrier.
An external voltage which decreases the potential barrier is said to act in the “Forward Bias” direction.

There are two operating regions and three possible “biasing” conditions for the standard Junction Diode and these are:

1. Zero Bias – No external voltage potential is applied to the PN junction diode.
2. Reverse Bias – The voltage potential is connected negative, (-ve) to the P-type material and positive, (+ve) to the N-type material across the diode which has the effect of Increasing the PN junction diode’s width.
3. Forward Bias – The voltage potential is connected positive, (+ve) to the P-type material and negative, (-ve) to the N-type material across the diode which has the effect of Decreasing the PN junction diodes width.

12/03/2019

The p-n junction is the transition area between two n- and p-doped semiconductor crystals. In this area there are no free charge carriers, since the free electrons of the n-conductor, and the holes of the p-doped crystal in the vicinity of the interface recombine with each other, which means that the electrons fill the holes. This charge movement (diffusion) is obtained in consequence of a concentration gradient: since there is only a few number of electrons in the p-area and only a few number of holes in the n-region, the majority charge carriers (electrons in the n-crystal, holes in the p-crystal ) move into the contrary doped semiconductor. The crystal lattice at the interface must not be interrupted, a simple "pressing together" of a p-type and a n-doped silicon crystal does not allow a functional p-n junction.

The regions near the interface are loaded due to the loss of free charge carriers (positive charge in the n-crystal, negative charge in the p-crystal). The more charge carriers recombine, the greater the depletion zone and thus the voltage difference of n- and p-crystal. With a certain amount of this potential gap, the recombination of holes and electrons comes to a complete standstill, the charge carriers can no longer overcome the electric field. In silicon this limit is at about 0.7 V.

19/12/2018

Specific Heat Capacity Definition:
Specific heat capacity is the amount of heat energy required to raise the temperature of a body per unit of mass. In SI units, specific heat capacity (symbol: c) is the amount of heat in joules required to raise 1gram of a substance 1 Kelvin.

Molar specifc heat capacities
for monoatomic gas
Cp = 5/2 R, Cv = 3/2 R

for diatomic gas
Cp = 7/2 R, Cv = 5/2 R

diatomic gas with vibrational energy
Cp = 9/2 R, Cv = 7/2 R

26/11/2018

There are 4 laws in thermodynamics.

Zeroth law of thermodynamics – If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

First law of thermodynamics – Energy can neither be created nor destroyed. It can only change forms. In any process, the total energy of the universe remains the same. For a thermodynamic cycle the net heat supplied to the system equals the net work done by the system.

Second law of thermodynamics – The entropy of an isolated system not in equilibrium will tend to increase over time, approaching a maximum value at equilibrium.

Third law of thermodynamics – As temperature approaches absolute zero, the entropy of a system approaches a constant minimum.

12/11/2018

Hydraulic lift
A hydraulic lift for automobiles is an example of a force multiplied by hydraulic press, based on Pascal's principle. The fluid in the small cylinder must be moved much further than the distance the car is lifted.

07/11/2018

Ignite coaching class ki taraf Se sabhi logon ko Diwali ki subhkamna. Social engineering ka ye parv apko sukh samridhi avam sadbudhi pradan kare.

25/09/2018

Aap sabhi logon ka bahut bahut dhanyawad, abhi abhi is page ko pasand karne wale logon ki sankhya 100 ke par pahunchi.
Aap sabhi logon ka bahut bahut dhanyawad. Aap logon ka prem humse yu hi bna rahe, hmari koshish hai ki hum aap logon tak Vigyan ko achche avam saral tarike se pahucha sake.

An institue for students inspired for Engineering.
We cover IIT-JEE, NDA competitive examinations.

22/08/2018

Total Work done by kuli in displacement of an object?

Few books have incorrect interpretation that work does equals to zero.
But basically kuli has done 3 works in different directions.
1. picking up the object,
2. Holding object and moving forward.
3. Relieving object at the place.

Here first and third work is in opposite direction so it will get cancelled by each other.

Now we have left with the work done by 2nd.

Here few books explain while holding we apply the force perpendicular to the ground, that's where it gets wrong since force is a reaction of the kuli from the ground that has a forward component
therefore force applied on the object will have a direction in mid of horizon and perpendicular.

Therefore total work done is not zero when displacement is not zero.

2nd explanation I found somewhere that gravity potential for earth like system everywhere is same. Therefore work done is 0.

This is incorrect in the sense, that gravity potential is same for surfaces which are purely spherical, but earth's shape is an oval. So it is incorrect explanation as well.