Two wires of different materials ,each 2m long and of diameter 2mm ‘are’ joined in series to form a composite wire.What force will produce a total extension of 0.9 mm.(Y1=2×1011Pa Y2=6×1011Pa )
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a
282.6N
b
212 N
c
319.8 N
d
382.6 N
answer is B.
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Detailed Solution
Ynet = 2Y1Y2Y1+Y2=2×2×1011×6×10112×1011+6×1011=3×1011F=YAeL=3×1011×3.14×10-32×0.9 ×10-34 =212 N