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The distance between an infinite planar sheet, uniformly charged with +10nC/〖cm〗^2, and a -5.0 nC point...

The distance between an infinite planar sheet, uniformly charged with +10nC/〖cm〗^2, and a -5.0 nC point charge is 4.0 cm. Determine the location(s), if any, where the electric field vanishes.

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