A copper bar of length \( L \) and area of cross section \( A \) is placed in a chamber at atmos...

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A copper bar of length \( L \) and area of cross section \( A \) is placed in a chamber at atmospheric pressure. If the chamber is evacuated, the percentage change in its volume will be (compressibility of copper is \( 8 \times 10^{-12} \mathrm{~m}^{2} / \mathrm{N} \) and \( \left.1 \mathrm{~atm}=10^{5} \mathrm{~N} / \mathrm{m}^{2}\right) \)
(1) \( 8 \times 10^{-7} \% \)
(2) \( 8 \times 10^{-5} \% \)
(3) \( 1.25 \times 10^{-4} \% \)
(4) \( 1.25 \times 10^{-5 \%} \)
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