The work per unit volume to stretch the length by $1\%$ of a wire with cross sectional area of $1\,m{m^2}$ will be. $[Y = 9 \times {10^{11}}\,N/{m^2}]$
  • A$9 \times {10^{11}}\,J$
  • B$4.5 \times {10^7}\,J$
  • C$9 \times {10^7}J$
  • D$4.5 \times {10^{11}}\,J$
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