A wire of length \( 8 \mathrm{~m} \) and radius \( 0.2 \mathrm{~mm}...

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A wire of length \( 8 \mathrm{~m} \) and radius \( 0.2 \mathrm{~mm} \), when
P stretshed by \( 200 \mathrm{~N} \) force extends by \( 0.4 \mathrm{~mm} \). The

W potential energy (in joules) stored in the wire is
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