As shown in the figure below, a solid insulating sphere of radius

a $=5\mathrm{.}00$ cm

carries a net positive charge

Q $=3\mathrm{.}00$C

that is uniformly distributed throughout its volume. Concentric with this sphere is a conducting spherical shell with inner radius

b $=10\mathrm{.}0$ cm$,$

outer radius

c $=15\mathrm{.}0$ cm$,$

and having net charge

q $=1\mathrm{.}00$C$.$

Determine the magnitude of the electric field $($in N$/$C$)$ at each of the following distances from the center of the spheres.

An insulating sphere with radius a is concentric with a larger conducting spherical shell of inner radius b and outer radius c$.$ a $<$ b $<$ c$.$

$($a$)$

r $=3\mathrm{.}00$ cm

N$/$C

$($b$)$

r $=8\mathrm{.}00$ cm

N$/$C

$($c$)$

r $=12\mathrm{.}0$ cm

N$/$C

$($d$)$

r $=17\mathrm{.}5$ cm

N$/$C

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