AP® Physics C: E & M

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Comparing Electric Field of Two Spheres


Two spheres are isolated from each other. They each have an identical net positive charge and the same radius. One sphere is solid and insulating while the other is a hollow conducting sphere whose charge is uniformly distributed.

Compare the electric field from the spheres at a distance $x$ from the center of the spheres? Assume $x$ is greater than the radius of the spheres.


The conducting hollow sphere has a greater E-field than the solid insulating sphere, which has a smaller E-field.


The insulating solid sphere has a greater E field than the hollow conducting sphere, which has a smaller E-field.


Both spheres have the same E field.


Neither sphere would cause there to be an Electric field.


Only the conducting sphere would cause an electric field.