Question

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) 

(1) zero 

(2) l/2 

(3) l 

(4) 2l 

Answer 1

Correct option (3) l 

Explanation:

In both the cases, the tension in the wire remains the same. So, elongation will be the same.