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A wire elongates by l mm when a load W is hanged from it.

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A wire elongates by l 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 mm)

(a) l/2 

(b) l 

(c) 2l 

(d) zero.

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