A spherical insulator has a radius of $R=0\mathrm{.}20m$ and is uniformly charged with a charge density of

$=2\mathrm{.}8{10}^{-6}\frac{C}{m^3}.$ What is the magnitude of the electric field at a point that is$...$

$($a$)0\mathrm{.}1m$ from the center of the spheres

$($b$)0\mathrm{.}20m$ from the center of the spheres?

$($c$)0\mathrm{.}3m$ from the center of the spheres?

$($Reminder: the volume of a sphere is $\frac{4}{3}{R}^3.)$

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