Discussion
A sphere of radius 2 m carries a uniform surface charge density of 1 nC/m². The total charge is about
Answer: D
Correct answer: 50.3 nC
\[ Q = \sigma \times 4\pi r^2 = 1 \times 4\pi \times 4 = 50.3\ \mathrm{nC}. \] The surface area of a sphere of radius 2 m is \( 16\pi \), or 50.3 square metres, so the numbers coincide here because the density is one nanocoulomb per square metre.
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