Explanation
Y = \dfrac { F l }{ A \Delta l }
\Delta l= \dfrac { F l }{ A Y}
\quad = \dfrac { 80 \times l }{ r { (\dfrac { 2 }{ 2 } ) }^{ 2 }\times { 10 }^{ -6 }\times 2\times { 10 }^{ 11 } }
\quad = 5.0 \times { 10 }^{ -4 }m
\quad = 0.5\ mm
B=-V\dfrac{dP}{dV}
Thus, \Delta V=-\dfrac{pV}{B} or V'-V=-\dfrac{pV}{B}
Or, V'=V(1-\dfrac{p}{B})
Now, \rho '=\dfrac{m}{V'}=\dfrac{m}{V(1-\dfrac{p}{B})}=\dfrac{\rho}{(1-\dfrac{p}{B})}
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