1. An Indian rubber cord L metre long and area of cross-section
- An Indian rubber cord L metre long and area of cross-section A metre 2 is suspended vertically. Density of rubber is D Kg/metre 3 and Young’s modulus of rubber is E newton/metre 2 . If the wire extends by l metre under its own weight, then extension l is
(a) L2 Dg/E (b) L2 Dg/2E
(c) L2 Dg/4E (d) L
Answer-b
(7)