A13.0 g piece of styrofoam carries a net charge of â5.40 î¼c and floats above the center of a large horizontal sheet of plastic that has a uniform charge density on its surface. what is the charge per unit area (in c/m2) on the plastic sheet?

σ =4.180×10^{-9} C/m^2

Explanation:

electric field due to non conducting sheet is

the force acting on the piece of Styrofoam

Eq= mg

⇒E= mg/q

now,

⇒

charge per unit area (in C/m2) on the plastic sheet σ =4.180×10^{-9} C/m^2

the answer is b i think

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