$A$ bulb of $800 \text{ W}$ electrical power has an efficiency of $3 \%$. It is kept at the centre of a sphere of diameter $20 \text{ cm}$. The force exerted on its surface by the electromagnetic $(EM)$ wave is . . . . . . .
- A$8 \times 10^{-12} \text{ N}$
- B$8 \times 10^{-8} \text{ N}$
- C$8 \times 10^{-10} \text{ N}$
- D$8 \times 10^{-6} \text{ N}$
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