Diameter $D = 13 \text{ cm} = 0.13 \text{ m}$
Radius of the sphere $r = \frac{D}{2} = \frac{0.13}{2} = 0.065 \text{ m}$
Charge $Q = 8 \text{ nC} = 8 \times 10^{-9} \text{ C}$
Distance from the surface $R = 3 \text{ m}$
Distance from the center of the sphere $d = R
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