A wire elongates by l mm when a load W is hanged from it. If the wire goes over a pulley and two weighs W each is hung at the two ends, the elongation of the wire will be (in mm) (a) l/2 (b) l (c) 2 (d) zero

Y = (Force x L)/(A x l) = WL/Al

l = WL/AY

Due to the arrangement of the pulley, the length of wire is L/2 on each side and so the elongation will be l/2. For both sides elongation = l

Hence, the correct answer is option (b)

Related Questions & Answers
Give An Example Of Combination Reaction Between Two Elements	Which Wave Type Is Used For Sound Ranging
Which Is Not A Cause Of Destruction Of Forests	What Do You Mean By Diversity
What Is Motion And Its Importance	Which Subatomic Particle Is Present In The Nucleus Of An Atom
What Is The Speed Of The Light	When Is The Attractive Property Of A Magnet Maximum
Why Are Sound Waves Called Mechanical Waves	What Are Weeds