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In part (a) of the figure an electron is shot directly away from a uniformly charged...

In part (a) of the figure an electron is shot directly away from a uniformly charged plastic sheet, at speed vs = 2.20 × 105 m/s. The sheet is nonconducting, flat, and very large. Part (b) of the figure gives the electron's vertical velocity component v versus time t until the return to the launch point. What is the sheet's surface charge density?

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