Discussion
A sphere encloses a total charge of 12 nC. The average flux density over its surface, of area 3 m², is
Answer: C
Correct answer: 4 nC/m2
\[ \frac{12}{3} = 4\ \mathrm{nC/m^2}. \] The word average matters: the flux density need not be uniform over the surface unless the geometry is symmetric, and this figure is the total flux divided by the area rather than the value at any particular point.
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