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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?
The sphere is made of metal.
The sphere is an insulator with uniform volume charge density.
The sphere is an insulator with volume charge density that is increases as r increases.
The sphere is an insulator with volume charge density that is decreases as r increases.
None of these conclusions is certain based on the graph.