A wire elongates by 1.0 mm when a load W is hanged from it. If this wire goes over a pulley and two weights W each are hung at the two ends, the elongation of the wire will be
A
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B
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C
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D
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Solution
The correct option is B Elongation in the wire ∞ Tension in the wire In first case T1 = W and in second case T2 = 2W×WW+W = W As T1T2=1∴l1l2=1⇒l2=l1=1.0mm