Discussion
For that same 10 nC charge, the flux density at 1 m is about
Answer: A
Correct answer: 0.796 nC/m2
\[ D = \frac{Q}{4\pi r^2} = \frac{10}{4\pi \times 1} = 0.796\ \mathrm{nC/m^2}. \] The flux is spread over the sphere’s area, and it is this division by \( 4\pi r^2 \) that produces the inverse square law - the flux itself does not fall off at all.
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