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![[Post New]](/templates/default/images/icon_minipost_new.gif) 5 Dec 2007 23:20:15 IST
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R=(rho)l/a So when the wire is twisted by the middle the area becomes 4times(as radius is doubled) an the length becomes half. Therefore,R'=(rho)1l/4a =(rho)1l/4=1/4 R=1ohm. Ans. If u have a doubt nudge me plz. And plzzzzzzzzzzzzzzzzzzzzzzzzzzzz rate.
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5 Dec 2007 23:43:56 IST
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sorry...............for replying so late.........my internet connection is not going smoothly.............
anyway,
@ ramyani, good job.............but tell me how will you find the head and tail of resistance if you are unable to identify the direction of current.........
@harsh.......never use these words again..........everyone is rite at his/her place ................if she is having some problem then let her ask and clearify her doubts...........
and this problem is not as simple as it is appearing...........
if ther r more than one twist , then it will be combination of resistances in parallel and series both................but in that case also, resultant resistance will be 1 ohm(or R/4 in a general case.....)
let there are n twists in wire.........then wire will be devided into 2n rsistances with each resistance equal to R/2n.........
now consider a single twist,out of n twists........as it contains 2 resistances in parallel ,so, resistance of single twist is R/(4n)....
and all twists are in series ........so nett resistance is n.(R/4n)=R/4
............................................................................................
is it clear........................
and remember...............
THINGS ARE NOT SO SIMPLE THAT APPEARS TO U....
SO,TRY TO SEE THE WORLD IN A DIFFERENT WAY!!!
as written in my signature.................
hehehehe......................
So, everybody............cheers!!!
donot take my any word to heart...........
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LOKESH SARDANA,
department of Production and Industrial engineering,
Indian Institute of Technology,Roorkee.
Happiness can be found, even in the darkest of times, if one only remembers to turn on the light.
Albus Dumbledore
Harry Potter and the Prisoner of Azkaban movie
There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.
-- Albert Einstein
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5 Dec 2007 23:53:41 IST
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ok, so R is 4 and hence u get 1. thanks!!
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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6 Dec 2007 23:45:20 IST
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Sorry for comments.But i was honest.I thought u should have solved it by urself as ur so intelligent.
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The heights by the great men reached and kept were not attained by a sudden flight ,but they while their companions slept were toiling upwards in the night.
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6 Dec 2007 23:49:47 IST
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dats ok. didnt take it seriously!! i did try!!! but got confused in that twisting part!!!
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Remember Cedric. Remember, if the time should come when you have to make a choice between what is right and what is easy, remember what happened to a boy who was good, and kind, and brave, because he strayed across the path of Lord Voldemort. Remember Cedric Diggory.
Albus Dumbledore
Goblet of Fire, Chapter 37, Page 724
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