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Q.

If the ratio of lengths, radii and Young's moduli of steel and brass wires in the figure are a, b and c respectively, then the corresponding ratio of increase in their lengths is

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a

2a2cb

b

3a2b2c

c

2acb2

d

3c2ab2

answer is B.

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Detailed Solution

TS = 3mg           3mgAs = yS×∆lSlS            2mgAb = yb×∆lblb            ∆ls∆lb = 32×lslb×AbAS×ybyS = 32×ab2c
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