A coil having 100 turns and the area 0.2 m^-2 is placed normally in a magnetic field. the magnetic field changes from 0.20 Wbm^-2 to 0.60 Wbm^-2 at a uniform rate over a period of 0.01 s .  calculate the induced emf in the coil.

A circular coil of radius 8cm and 20 turns rotates about its vertical diameter with the angular speed of 50 s^-1 in a uniform horizontal magnetic field of magnitude 3 * 10^-2 T . find the maximum and average value of the emf induced in the coil.

Kamla paddles a stationary bicycle . the paddles of the bicycle are attached to a 100 turn coil of area 0.10 m^2 .  The coil rotates at half a revolution per second and it is placed in a uniform magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. What is the maximum voltage generated in the coil?

Derive the expression for (1) induced emf , (2) induced current  , when a conductor of length L is moved with a uniform velocity v , normal to a uniform magnetic field B .  assume the resistance of the conductor to be R.

In a 100  turn coil a magnetic flux of 8 * 10^-4 Wb is linked when a current of 2A is sent. what is the self inductance of the coil?

A circular copper disc 10cm in radius rotates at 20 pie rad/s about an axis through its centre and perpendicular to the disc. a uniform magnetic field of 0.2 T acts perpendicular to the disc. 

         (a) calculate the potential difference developed between the axis of the disc and the rim.
         (b) what is the induced current of the resistance of the disc is 2 ohm.

A coil Q is connected to low voltage bulb B and placed near another coil P as shown in fig. give reasons to explain the following observations.
(a) the bulb 'B' lights.
(b) Bulb gets dimmer if the coil Q is moved towards left.

fig. below shows planar loops of different shapes moving out of or into a region of a magnetic field which is directed normal to the plane of the loop away from the reader. determine the direction of induced current in each loop using lenz's rule.

ELECTRIC POTENTIAL AT ANY POINT DUE TO AN ELECTRIC DIPOLE...........

MAGNETIC FIELD DUE TO TORROID..........

MAGNETIC FIELD DUE TO SOLENOID..........

AMPERE CIRCUITAL LAW.......

MOVING COIL GALVANOMETER..........

expression for energy stored in a solenoid.....

expression for self inductance of a long solenoid.........

conservation of energy using lenz's rule....

Determine the direction of induced current produced in the coil if the current flowing in the wire XY is
1- constant
2- increasing
3- decreasing

LENZ'S RULE......

MAGNETIC FLUX.......

A wheel with 10 mettalic spokes each 0.5m long is rotated with a speed of 120rev/min in a plane normal to the earth's magnetic field at the place. if the magnitude of the field is 0.4 gauss  , what is the induced EMF between the axle and the rim of the wheel?

Missile man of India...

Dr APJ Abdul Kalam , what a great inspiring personality!
his each word had a story in it. each sentence spoken by him was full of knowledge and experience. he was a great source of inspiration for youth. 
simplicity is one of the best thing which one can learn from his attributes.
the best thing i learned from him is that never stopping working. always stay busy since empty mind is the house of evil . 
he defined 'rest ' as the satisfaction one gets when he/ she achieves his goal. 
he had the purest of hearts and used to say " to be a leader one should have a perfect vision of  his objectives. he should be able to take up both the failures and successes. "
Dr APJ Abdul Kalam ,  the Missile man of india had ignited the fire in the youth to strive toward perfection. he had a great beleif in future generation.
May his soul rest in peace . as  a citizen of India, i have a great respect for him and i belief that his works will inspire and motivate the youth for decades.

Why do we love programming?

Imagine a magical wand , which can solve almost any problem in this world. Which can even make you rich or change your life within no time and can create anything or help people to solve their problems. And can by used by any human on this planet regardless of his/her age, caste , social status. All you need to know is how to use it. I believe programming is this magical wand.

Also programming is a very powerful art just like any other art like painting,  music or poetry. It is a tool to your brain. It's is freedom,  anyone can give Life to their ideas with the help of programming. Let it be a poor village girl or rich kid in top University  or 70 year old man or 12 year old kid . It is very powerful , as you can impact so many people across the globe . A really gifted programmer can make a fortune and world is witnessing many such young billionaires in 21st century. You can discuss about your ideas with best of best minds or get their feedback, come together create something new or solve really challenging problems. and the demand for these artists in future is exponential as computing devices have become part of our life.think about these beautiful, magical billion dollar creations like Facebook, Google or advanced AI technology like Sophia . Unlike any other art , programming solves problems and makes Human life much better. All you need is a computer and passion of solving problems. Programming is a magical wand of 21st century.....

Mass energy equivalence...

Mass-energy equivalence is the famous concept in physics represented mathematically by E=mc^2 , which states that mass and energy  are one and the same .This equation gives the amount of energy equivalent to a certain mass and is a result derived from Einstein's theory of relativity.A consequence of the mass–energy equivalence is that if a body is stationary, it still has some internal or intrinsic energy, called its rest energy, corresponding to its rest mass.

History of india....

How India was captured by Britishers? When we think of what happened at the time of our forefathers we realised the pain through which they have gone. It might be physical pain but they were most probably being hurted to be the slave. They may be hurted to see their nation being caught by whitemans....
It was a story of general of British named Lord Macaulay who just visited to give the idea of capturing INDIA . When he visited here, what he saw is , he even can't imagine...he wrote a letter to England where he told is
""" I HAVE TRAVELLED ACROSS THE LENGTH AND BREADTH OF INDIA AND I HAVE NOT SEEN ONE PERSON WHO IS A BEGGAR, WHO IS A THIEF SUCH WEALTH I HAVE SEEN IN THIS COUNTRY  , SUCH HIGH MORAL VALUES , PEOPLE OF SUCH CALIBAR , THAT I DO NOT THINK WE WOULD EVER CONQUER , THIS COUNTRY , UNLESS WE BREAK THE VERY BACKBONE OF THIS NATION ,  WHICH IS HER SPIRITUAL AND CULTURAL HERITAGE  AND THEREFORE , I PROPOSE THAT WE REPLACE  HER OLD AND ANCIENT EDUCATION SYSTEM , HER CULTURE , FOR IF THE  INDIANS THINK THAT ALL THAT IS FOREIGN  AND ENGLISH IS GOOD AND GREATER THAN THEIR OWN ,  THEY WILL LOOSE THEIR  SELF-ESTEEM , THEIR NATIVE CULTURE  AND THEY WILL BECOME WHAT WE WANT THEM, A TRUELY DOMINATED NATION """

Don't let problems to be a fear of life

A service engineer in New York checked his email one evening and found a requisition from a company in Jacksonville, Florida . For him to come the next day to repair the machine they had purchased. The other email was from a client in Bakersfield, California, insisting that their plant had come  to a standstill and he definitely had to report there the next day for repairing the machine. He went to sleep pondering.what was to be done. Next morning, there was one message from midfield, Texas saying that if he did not report there as soon as possible, they would cancel the order. This man munched his breakfast, gathered his stuff , walked out of his house and waved a taxi . The taxi driver came and said,  sir where should I take you? The man said take me anywhere! I don't care. I have problems everywhere. isn't that very often the way life is! When problems are unavoidable part of our life , we need to have a solution for handling them!!!!! Don't let your problem to be a fear of your life......!!!!!

Current situation of schooling education.

Mark Twain once said , I never let my schooling education interfere with my own education. What was the reason behind this statement, in my opinion schooling education is turning millions of students into robot zombies.schooling education is resisting children to get their gifts, thinking they are stupid believing they are useless.
Not even mark Twain , Albert Einstein once said everybody is a genius but if you judge a fish by its ability to climb a tree , it will live it's whole life believing that it is stupid. In this era schooling education is not only making fish climb trees but also makes them climb down.
Students are made in straight rows, nice and neet , tell them raise your hand if you wanna speak , give them a short break to eat and for 8 hrs a day tell them what to think. All this makes them with grade A , a letter which determines the product quality.
A teacher stands in front of 30 kids having different dreams , different ideas , different ambitions but teacher teaches the same thing the same way....
Do you think the bubbling multiple choice can decide the success of a student. Infact these test are too crude to be used and should be abandoned.
I am not against the schooling education but if we continue down with this world the result will be lethal. I don't have much faith in schools but I have faith in man. If we can customize Facebook pages , cars , medical care than it is our duty to do the same with schooling education to upgrade it change it. Do away with the school spirit because that's useless until and unless we are not working to bring the spirit out of each and every student.
Sure maths is important but not more than art and dance. Let's give every gift an equal chance. I know it sounds like dream but countries like Finland are doing impressive things. They have shorter school days , teacher make decent wage , hw is not existing and they focus on collaboration rather than competition. So let's attain this coz though students are 20% of our population they are sure 100% of our future. So let's go through the dreams of every student without telling them what they can achieve....this is the world in which the fish is no longer forced to climb tree

Success story of mark Zuckerberg...

While many intelligent people attend Harvard University, Mark Zuckerberg became known quickly as the go-to computer programmer on campus. By his sophomore year, he had already built two programs: CourseMatch and FaceMash. Both programs became wildly popular, but the university shut down the latter program after it was deemed to be inappropriate.

Based on his acclaim on campus, Zuckerberg partnered with friends to create a social networking site that allowed Harvard students to connect with each other. The site officially went live in June 2004 under the name "The Facebook," and Zuckerberg ran it out of his dorm room.

After his sophomore year, Zuckerberg dropped out of college to pursue what was then called Facebook full-time. The website reached 1 million users by the end of 2004.

This explosion of user growth attracted the attention of many venture capital (VC) firms, and Zuckerberg eventually moved out to Silicon Valley in 2005. Facebook received its first round of venture capital investments from VC firm Accel Partners, which invested $12.7 million in the site that was still only open to Ivy League students.

By the end of 2005, however, Facebook had opened up to students attending other schools, causing the website to reach 5.5 million users. Since 2005, Facebook has received numerous acquisition offers from the likes of Yahoo and Microsoft, has been through legal battles, and has greatly increased the its users.

On July 25, 2018, Facebook released Q2 earnings. The company reported that daily active users averaged 1.47 billion for June 2018, an increase of 11% year-over-year. Monthly active users totaled 2.23 billion as of June 30, 2018, an increase of 11% year-over-year. As of July 30, 2018, the company has a market cap of $483 billion. Zuckerberg owns 14.18 million Class A Facebook shares in a series of funds, as of July 25, 2018. He also owns  441.6 million Class B shares. With control of over nearly 89% of Class B shares, Zuckerberg holds 60% of voting rights in the company.

Why education should be free?

Education is vital and maybe the source for hope in the future.

Everyone needs education. At least the fundamental type which is Primary. People should not have to pay for education. If we didn't have education, we wouldn't be expressing our opinions in the first place. If we didn't have education, we wouldn't be able to even read what I just said. Not many people have a successful career in their lives, and if education is not free, they may not have the sufficient funds to help their children go to school. What this would mean is they may not get the skills they need for their future to find a job or even hope. Many people in Africa and other places which does not provide free education as a law, when asked, wished they had education. Not all countries have a good economy. If everyone had free education, maybe the world would be a better place...

art is important than maths.....

 Math is definite, art isn’t. Art has no boundaries, boxes and a guideline to adhere to. I’ve been taught Math for around two decades and I still dislike it. Art is a new language for me. I’ve just started to explore it and I like art and the people who do it. (“Artists” as we call them)

People who make art eventually become one. They don’t belong to the herd. They know to let go, don’t expect ego massages, live as a global citizen, don’t develop an affinity towards something non-secular.

A person who inhales and exhales with a blank mind is an artist.

I know, you are trying it and failing to achieve it now.

Can we inhale and exhale without thoughts running in the background? (good and bad)

Some call this Yoga, I call this art.