2.3.2 A sphere with volume charge
The same experience is repeated, but now the moving
enters within a sphere with volume charge. The field outside the sphere
is again the same as that of a point charge placed at the centre of the
sphere, but the field inside the sphere does not vanish. Instead, the
field increases proportional to the distance from the centre.
Rotate with the xyZET keys to confirm that the
distribution occupies the volume of the sphere. In the simulation, the
sphere is modelled by means of point charges, thus causing strong
in the field when the test charge moves across the sphere.
it may be seen that the field cancels when the charge passes through
centre of the sphere.