You need to create a uniform electric field in a small region of space, and all you

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You need to create a uniform electric field in a small region of space, and all you have to work with is one large styrofoam ball that carries a uniform volume charge distribution \(ho\). You cut the ball into two sections and scoop a hemispherical hole out of each section so that putting the sections back together results in a spherical cavity off-center inside the ball. You know that the cavity can be described as a region composed of equal amounts of uniformly distributed positive and negative charge carriers, giving it a charge of zero. You suspect the principle of superposition might be useful. What is the electric field magnitude in the cavity?

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