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A wire elongates by l mm when a load W i...

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

2l

B

zero

C

l/2

D

l

Text Solution

Verified by Experts

The correct Answer is:
D
`Delta l= l xx 10^(-3) m, T_(1)= F_(1)= W`
`T_(2)= F_(2)= W`

Since, Tension in the wire in both cases are equal, Hence, `Delta l` is same
`Delta l= lmm`
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