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![[Post New]](/templates/default/images/icon_minipost_new.gif) 29 May 2007 19:34:11 IST
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If two wires of same dimension but different resistivities  1 and  2 are connected
in parellel then what is the equivalent resistivity of the combination?
Sir,do you think the answer is 1 2 / 2 ( 1 + 2) ?Correct me if I am wrong.
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29 May 2007 19:35:56 IST
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Ooops! I think those symbols are not visible on your browser.Those are rho1 and rho 2.
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29 May 2007 19:59:41 IST
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hi lolita........wot i think is......since dimensions r the same soo R is proportional to rho. wires r connected in parallel.....n if equivalent resisitivity is denoted by rho then...........1/rho = 1/rho1 + 1/rho2
sooo....v ll get rho = rho1.rho2/(rho1+rho2)
sorry if i m wrong......but i think dis is the answer :)
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29 May 2007 21:41:23 IST
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when resistances are conncted in parallel, then 1/ R = 1/ R1 + 1/R2 also R1 =  1 l/a and R2 = 2 l/a let be the equivalent resistivity , then R = l/a
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Manasi....
NIT-Allahabad...
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Challenges are High, Dreams r New..
The World out thr is waiting for U !!
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31 May 2007 10:26:44 IST
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Oh o...... No Ruhi you are not right.It is too simple and I should have slapped myself.Your answer is absolutely wrong .But this expert !!!What is is his name ......oh....Magic..whatever.., you have ignored the key sentence
"If two wires of same dimension but different resistivities" and
"connected in parellel ".When they are connected in parallel their combined cross section becomes 2a.
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31 May 2007 14:12:15 IST
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Miss Lolita, I have done the very same thing, what ruhi has said..infact the answers are even same.... and let me tell u , joining two wires in parallel connection, wont get the cross-section area 2a... just see it properly once, before saying PS: and my username is magiclko (pronounced as magic L K O )....and my signature contains my name "manasi"...
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Manasi....
NIT-Allahabad...
............................................................
Challenges are High, Dreams r New..
The World out thr is waiting for U !!
Dare to dream, Dare to Try..
No Goal is distant, no Star is too high !!! |
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31 May 2007 20:04:42 IST
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and wat does L K O mean?
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31 May 2007 23:15:01 IST
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LKO is normally the short form used for lucknow, the place whr i live!!!! i knw its pretty weird, infact doesnt make sense at all... bt i dnt knw why i used that username!!!
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Manasi....
NIT-Allahabad...
............................................................
Challenges are High, Dreams r New..
The World out thr is waiting for U !!
Dare to dream, Dare to Try..
No Goal is distant, no Star is too high !!! |
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2 Jun 2007 10:41:53 IST
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1/R=1/R1+1/R2
1/* /a=1/  1*/a+1/2*/a
1/=1/1+1/2
=1+2/12
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