The Young's modulus of a rubber string 8 cm long and density 1.5

Question

\frac{k g}{m^{3}}

is 5

\times 10^{8} \frac{N}{m^{2}}

. It is suspended from the ceiling in a room. The increase in length due to its own weight will be

Options:

A . 9.6× 10−5 m

B . 9.6× 10−11m

C . 9.6× 10−3m

D . 9.6 m

Answer: Option B
:
B
b):l =

\frac{L^{2} d g}{2 Y}

\frac{(8 \times 10^{- 2})^{2} \times 1.5 \times 9.8}{2 \times 5 \times 10^{8}}

= 9.6

\times 10^{- 11} m

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