The conversion efficiency of a solar cell is $12 \%$. For a maximum power output of $9 \times 10^{-3} \mathrm{~W}$ at an incident solar radiation of $250 \mathrm{Wm}^{-2},$ the required surface area of the solar cell in $\mathrm{mm}^{2}$ will be____________

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The conversion efficiency of a solar cell is $12 \%$. For a maximum power output of $9 \times 10^{-3} \mathrm{~W}$ at an incident solar radiation of $250 \mathrm{Wm}^{-2},$ the required surface area of the solar cell in $\mathrm{mm}^{2}$ will be____________