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Question: an infinite horizontal plane of uniform negative charge sits at...

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An infinite horizontal plane of uniform negative charge sits at a height of z=0z=0. For a point at a height of z=-3mz=−3m (i.e., 3 meters below the infinite plane), the electric field has a magnitude of , 67.2 \frac{N}{C}67.2​C​​N​​. Calculate the magnitude of the surface charge density, \sigmaσ, of the infinite plane of charge in units of \frac{C}{m^2}​m​2​​​​C​​

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