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# Constant $E$ in a Sphere

APPHEM-L5WC9N

The diagram shows a material formed into a sphere of radius $R$. The diagram shows the magnitude of the electric field $E$ as a function of distance $r$ from the center of the sphere.

Which of the following can be concluded from this graph?

A

The sphere is made of metal.

B

The sphere is an insulator with uniform volume charge density.

C

The sphere is an insulator with volume charge density that is increases as r increases.

D

The sphere is an insulator with volume charge density that is decreases as r increases.

E

None of these conclusions is certain based on the graph.