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Q.

An aluminium αAl=4×103/0C wire resistance ‘R1’ and carbon wire αc=0.5×103/0C resistance ‘R2’ are connected in series to have a resultant resistance of 18 ohm at all temperatures . The values of R1 and R2 in ohms

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a

14, 4

b

13, 5

c

2, 16

d

12, 6

answer is A.

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Detailed Solution

R1+R2=18Ω

R2R1=α1α2=4×1030.5×103=405=8;

R1=2Ω,R2=16Ω

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