Well I'm much fascinated and want to make one like this.
All I Care For - The Rich Man's Fallacy
Some people always go after wealth and wealth alone, losing all those little pleasures of human life.
Once there was a rich man who cared nothing about anything other than wealth. He bought an Audi car and was driving it along a highway to show off his new object of pride to his wealthy friends. Suddenly his car was overrun by a truck, and to his horror, the rich man noticed his car's driver side door was missing.
He was much worried about this as it would be never the same again even if he repaired his Audi. He ran to the nearby traffic police and complained bitterly about the harsh truck driver. When the policeman looked at him, he was dumbfounded and exclaimed: "But sir look down you are missing your right arm". The rich man looked down and screamed, Öh! My Rolex !"
Curious Little Cylinder Near the End of My Charger Wire. What is This?
If you own a laptop, chances are that you often wondered what was that little cylinder at the end of your charger wire.
As it is worthwhile to know what it is as it has interesting physics behind it. Perhaps or Surely you are all acquainted with what an inductor is. But for a general reader, I would like to clarify it a bit more. An inductor is a coil of wire that has the property of building up a magnetic field associated with it.
But there is a rule called Lenz law that tells you that there is no free lunch in mumbo-jumbo terms. This rule is given in the usual text book jargon below :
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| Cute Little Cylinder at the End of My Laptop Charger |
As it is worthwhile to know what it is as it has interesting physics behind it. Perhaps or Surely you are all acquainted with what an inductor is. But for a general reader, I would like to clarify it a bit more. An inductor is a coil of wire that has the property of building up a magnetic field associated with it.
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| An Inductor |
But there is a rule called Lenz law that tells you that there is no free lunch in mumbo-jumbo terms. This rule is given in the usual text book jargon below :
The direction of current induced in a conductor by a changing magnetic field due to Faraday's law of induction will be such that it will create a field that opposes the change that produced it.
So, as the inductor is reluctant to change the magnetic field associated with it, it offers a resistance to the flow of current in proportion to the rapidity with which the current changes. High frequency currents changes their polarity more frequently than their low frequency fellow currents.In essence an inductor is not well with the high frequency currents and block them then and there to a greater extent than low frequency currents. Not only coils of metal, but a ceramic material called Ferrite (which is basically rust mixed with certain other metals) surrounding a single wire can act as a sort of inductor. If AC power is supplied to a sensitive electronic device which our laptop certainly is, it is wise to surround the wire near the end of charger wire by Ferrite cylindrical shell for the following two reasons:
Credits: By Omegatron - Taken by User:Omegatron using a Canon Powershot SD110, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=3842054
So this tiny little cylindrical shell at our charger wire let to us to contemplate a bit of curious physics behind it. I am positive that this post interested you and you are eager to know more facts how physics play a central role in every piece of technology. I'm also eager like you and whenever I stumble on a good one I shall let you know that. If you have observed something curious please bring it to my attention through the comments.
- AC power lines come with spikes, i.e., sudden variation in supply voltages which passed through the SMPS (oh ! that black brick which we call charger) affect the performance of our Laptop.
- The long charger wire acts like an antenna, and due to EMI (Electro Magnetic Interference) may feed all sort of unwanted signals into our laptops motherboard circuitry.
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| Charger Wire or Antenna ? |
So, to avoid these interferences and improve the performance charger manufacturers add a a small cylindrical shell of Ferrite ceramic material which is called a "Ferrite Bead".This Ferrite Bead effectively isolates the laptop from unwanted high frequency current noises, but let the DC component of current charging your laptop to pass through.
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| Ferrite Bead with Plastic Cover Removed |
So this tiny little cylindrical shell at our charger wire let to us to contemplate a bit of curious physics behind it. I am positive that this post interested you and you are eager to know more facts how physics play a central role in every piece of technology. I'm also eager like you and whenever I stumble on a good one I shall let you know that. If you have observed something curious please bring it to my attention through the comments.
Who's This Unknown Guy?
A couple of days back I've spotted this insect crawling along the outer wall of our laboratory. Very eerie looking but I could n't identify its species then. Now after googling a bit I've found what It is. It is a House Centipede, More specifically, Scutigera coleoptrata. Literally Ä Hundred Legs". Count yourself patiently. But I suspect this lags a lot.
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| Mr.Hundred Legs Crawling on the Laboratory Wall |
A detailed Image from Wikipedia:
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| Scutigera coleoptrata |
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