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Q.

Three unequal resistors in parallel are equivalent to a resistance 1 ohm. If two of them are in the ratio 1 : 2 and if no resistance value is fractional, the largest of the three resistance in ohm is

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a

4

b

6

c

8

d

12

answer is B.

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Detailed Solution

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 Let R1=R,R2=2R,R3 1Rp=1R1+1R2+1R311=1R+12R+1R3 1R3=1-32RR3=2R2R-3 R=1Ω,R3=-ve wrong  R=2Ω,R3=4Ω same as R2, wrong  R=3Ω  R3=2Ω;R1=3Ω,R2=6Ω,R3=2Ω Max=6Ω

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