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JEE Main 2006 (AIEEE) · Wire Combinations & Special Cases

Wire Combinations & Special Cases question from JEE Main 2006 (AIEEE)

Q31JEE Main 2006 · AIEEEMedium

Wire Combinations & Special Cases

A wire elongates by $l\text{ mm}$ when a LOAD $W$ is hanged from it. If the wire goes over a pulley and two weights $W$ each are hung at the two ends, the elongation of the wire will be (in $\text{mm}$ )

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Answer: (a)

With $W$ hanging from a fixed support, the tension in the wire is $W$ .
Over a pulley with $W$ at each end, each side balances the other, so the tension is still $W$ .
Same tension gives the same elongation: answer (a) $l$ .

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