Question

An electron is shot directly away from a uniformly charged plastic sheet, at speed vs= 3.8 x 105 m/s, as shown below. The sheet is nonconducting, flat, and very large.

(s/ 01) 3 6 + + + + + + + + t(ps) (a)

Figure (b) 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?

(Use units of 10-6 C/m2 and 2 decimal places for your answer)

Answer: 5.47 margin of error +/- 0.05

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Answer #1

slop of vot graph = a 6-3.5x105 0.54x1 7x1512 F E = ma Eq=ma m/ 2 E sheet 2 xq = ma t = max2to 9 os 9.1x10-31 x 0.54x lot x 2

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