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Q.

The lengths of two metallic rods at temperatures θ are LA and LB and their linear coefficient of expansion are αA and αB respectively. If the difference in their lengths is to remain constant at any temperature then

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a

LALB = αAαB

b

LALB = αBαA

c

αA = αB

d

αAαB = 1

answer is B.

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Detailed Solution

Change in LA = change in LBi.e., ∆LA = LB⇒ αA∆TLA = αB∆TLBor αALA = αBLB

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