Lightning strike ,how passengers and our avionics components are safe in a that much intensity of electricity.

The electricity is all around us , in our daily routine we used it in most of our things. It is very useful when we used it in a control amount ,but when it is out of control it's very much harmful, we se the dangers of electricity in lightning strike .

 The one single flash of lightning strike carry 1 million volt. And 30000 thousand of current this much amout of charged sufficient to destroy toughest metals in world. One research found that single high voltage flash of lightning strike have heat as same as heat having the surface of sun.

    But do you imagine that in b/w 1000 to 2000 hrs. Of flying our civil airplane sustain more than one flashes of lightning strike with nothing or small damage to the structure of airplane. 

    This credit is going to our brealint scientist mickeal Faraday. 

  In 1755  Ben-franklin done a research on electricity and found something amazing , he put a metal ball in a metal container and provide electric current to the container he found no movement in the position of metal ball , but when he take the metal ball near the outer surface of that container, the metal ball is attached with the outer surface of container . But Ben-franklin are fail to explain his theory that why exactly this happen.

         In beginning of 19th century Micheal Faraday start working on Benz theory again . In 1836 he cover  a room with many metal wires and put a electroscope in the room and give electric power to the metal wires with the help of generator ( Electroscope is a instrument who give signal in the presence of electric field) . He found no movement in the Electroscope reading. 

      And he give a theory of Faraday cage.

Know discuss why this happened , When Some electric current given to the metal cage they create a electric field around him , the electric current flows from one end to other end . The some negative charge create on the one end and some positive charge create on the other outer surface of metal cage . This outer charges attract apposite charge from inside , external positive charge attract negative charge from inside and external negative charge attract positive charge from inside. This two internal and external charges create apposite direction electric field. Internal electric field trevel apposite side in compear with external electric field, because apposite charges accumulate in the inside and outside the wall of hollow metal cage. But electric field trevel from negative charges to positive charges(or positive charges to negative charges). This apposite electric field cancel the field inside the hollow metal cage and Cause of this no current flow inside the metal cage because the electric field is zero inside the cage. 

         With the use of same Micheal Faraday theory the moduren airplane are made. This cage type structure theory is Soo effective . Even most of time flight crew or passanges never know that some outside lightning strike hit the structure of airplane. 

According to a report of NASA , in a single flesh of lightning strike 1million volt and 30000 amp. Current are generated but when lightning strike impact on a airplane nothing happens even airplane flying or on ground. This answer of the question is Ina a design of aircraft.

 

           Electricity is the lifeblood of many aspects of our world. Without volts and amps, many of our technological innovations would cease to exist. Even our bodies wouldn't function without an electrical charge zipping through our cells. But what electricity gives, electricity can take away.

Although this form of energy is vital to so much of our lives, it's one of those things that are only good in the right amounts. Too much electricity can electrocute people. Likewise, it can kill our modern electronics and machines

But thanks to Michael Faraday, the brilliant 19th-century scientist, and one of his namesake inventions, the Faraday cage, we humans have developed plenty of ways to control electricity and make it safer for our computers, cars and other inventions -- and for us, too.

Faraday cages shield their contents from static electric fields. An electric field is a force field surrounding a charged particle, such as an electron or proton.

These cages often look distinctly, well, cage like. Some are as simple as chain-link fences or ice pails. Others use a fine metallic mesh. Regardless of their exact appearance, all Faraday cages take electrostatic charges, or even certain types of electromagnetic radiation, and distribute them around the exterior of the cage.

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Electromagnetic radiation is all around us. It's in visible and ultraviolet light, in the microwaves that cook our food and even in the FM and AM radio waves that pump music through our radios. But sometimes, this radiation is undesirable and downright disruptive. That's where Faraday cages come in.

As a Faraday cage distributes that charge or radiation around the cage's exterior, it cancels out electric charges or radiation within the cage's interior. In short, a Faraday cage is a hollow conductor, in which the charge remains on the external surface of the cage.

That basic function has plenty of fascinating uses in our electrically cluttered and technology-packed world. And although Faraday would eventually have his day, the backdrop for his invention actually has its roots in earlier times. So, where did the idea for these ultra-useful cages come from? Find out on the next page.

It was Ben Franklin who helped inspire many of the ideas behind Faraday cages. Franklin, of course, spent part of his illustrious career flying kites in thunderstorms in attempts to attract lightning and thus was already somewhat acquainted with the vagaries and concepts of electricity.

In 1755, Franklin began toying with electricity in new ways. He electrified a silver pint can and lowered an uncharged cork ball attached to a non-conductive silk thread into it. He lowered the ball until it touched the bottom of the can and observed that the ball wasn't attracted to the interior sides of the can. Yet when Franklin withdrew the cork ball and dangled it near the electrified can's exterior, the ball was immediately drawn to the can's surface.

Franklin was mystified by the interplay of electricity and the charged and uncharged objects. He admitted as much in a letter to a colleague: "You require the reason; I do not know it. Perhaps you may discover it, and then you will be so good as to communicate it to me."

Decades later, an English physicist and chemist named Michael Faraday made other pertinent observations -- namely, he realized that an electrical conductor (such as a metal cage), when charged, exhibited that charge only on its surface. It had no effect on the interior of the conductor.

Faraday reaffirmed this observation by lining a room with metal foil and then charging the foil with the use of an electrostatic generator. He placed an electroscope (a device that detects electrical charges) inside the room, and, as he anticipated, the scope indicated that there was no charge within the room. The charge just moved along the surface of the foil and didn't penetrate the room at all.

Faraday further examined this phenomenon with his famous ice pail experiment. In this test, he basically duplicated Franklin's idea by lowering a charged brass ball into a metal cup. As expected, his results were the same as Franklin's.

This concept has all sorts of amazing applications, but here's one that's relevant to anyone who's ever been in an airplane. Imagine flying in an airplane that's suddenly struck by lightning. This isn't a rare occurrence -- it actually happens regularly, yet the plane and its passengers aren't affected. That's because the aluminum hull of the plane creates a Faraday cage. The charge from the lightning can pass harmlessly over the surface of the plane without damaging the equipment or people inside.

Credit: Bhupinder Singh

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