Graphical variation of electric field due to a uniformly charged insulating solid sphere of radius R , with distance r from the centre O is represented by:

Step-by-step solution

The electric field inside a solid insulated sphere is given by E i n s i d e = ρ r 3 ε 0 for r < R where ρ is volume charge density. Hence, the electric field varies linearly with the distance as E inside ∝ r 1 Now, the electric field for r > R is given by E o u t s i d e = Q 4 π ε 0 r 2 E outside ∝ 1 r 2 Thus, the graph starts decreasing as a power law graph as shown in the figure for the region r > R . Hence, this graph is the right option.