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1. An Indian rubber cord L metre long and area of cross-section

  1. 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)

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