In the following figures, which figure represents the variation of...

The electric field intensity at a point lying outside the sphere (non-conducting) is

$E = \dfrac{1}{4\pi{ε}_{0}} \cdot \dfrac{q}{r2}$

i.e. $E ∝ \dfrac{1}{r2} \ldots \left(i\right)$

The electric field intensity at the surface $( r = R )$,

$E = \dfrac{1}{4\pi{ε}_{0}}\dfrac{q}{R2}$

$⇒ E ∝ \dfrac{1}{R2}$

where, $R$ being the radius of sphere,

The electric field intensity inside the sphere is

$E = \dfrac{qr}{4\pi{ε}_{0}R^{3}}$

$⇒ E ∝ r$

At the centre of sphere, $r = 0, ∴ E = 0$