A non-conducting solid sphere of radius R is uniformly charged. The magnitude of the electric field due to the sphere at a distance r from its center.
Text Solution
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(a, c)
Inside the sphere 
i.e. E at centre 
as 
and 
at surface 
as 
Outside the sphere
for 
or 
Thus, variation of electric field (E) with distance (r) from the center will be as shown.
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