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Blazing goIITian

Joined:	31 Jan 2007
Post:	515

19 Apr 2008 20:52:30 IST

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eq. resistance-2!!!!!!!!!!!

None

how do v find the eq R in infinite r combinations.plz give a general method for these.i am stuck half way thru.

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bhavna kaul

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Joined: 27 Jan 2008

Posts: 5

19 Apr 2008 21:43:09 IST

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the basic concept used in such questions is tht if we add sumthing to infinity it remains infinity..

now let the eq resistance of infinity be x.

consider one same pattern of resistance connected to it..[assume one more U shaped resistance]

now the eq.reistance of parallel comb. is

xR/x+R

nw it is connected to two resistances(R) in series..

therefore eq. resistace will be

R +R + xR/x+R =x

['coz we hav assumed the eq resistance of infinity x nd we know sumthins added to infinity remains same.. ]

by solving this we'll get a quadratic equation which can be solved easily...

i guess d ans will be

x= R(1+1.732)/2

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