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[Post New]25 Feb 2007 19:25:57 IST
    Subject: who wants to be in iit
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01725074660vir (41)

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Olaaa!! Perrrfect answer. 7  [10 rates]
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Hi i think the sol. is


Let R1 & R2 be the 2 resistances . thermal power generated in the circuit is

P =i^2( R1R2/R1+R2)
in parallel combination,thermal power will be minimum if:

i^2 (R1R2 / R1+R2) < i^2 (R1 + R2).......(res. in series)
or
i^2 [R1R2/R1+R2 - (R1+R2)] < 0............(1)

= i^2 [R1R2 - (R1+R2)^2/ R1+R2]

= i^2 [-(R1^2 + R2^2 + R1R2] / R1+ R2

since it is less than zero hence =n (1) satisfied


hope my ans is correct plz give me the hat
where there is a will there is a way
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