$($a$)0cm$ from the center of the sphere

kN$/$C

$($b$)10\mathrm{.}0cm$ from the center of the sphere

$k\frac{N}{C}$

$($c$)40\mathrm{.}0cm$ from the center of the sphere

$k\frac{N}{C}$

$($d$)69\mathrm{.}0cm$ from the center of the sphere

$k\frac{N}{C}$

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