Physics, 08.07.2020 22:01, keenansimpkinsoy0oqc

A plastic sheet with a uniform surface charge density of −3.90 µC/m2 lies in a horizontal plane. What charge (magnitude and sign) must a piece of Styrofoam with a mass of 30.0 g have, if it is in equilibrium (it hovers) below the sheet?

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A plastic sheet with a uniform surface charge density of −3.90 µC/m2 lies in a horizontal plane. Wha...