An electron is released from rest at a distance of 0.390 m from a large insulati

Question

An electron is released from rest at a distance of 0.390 m from a large insulating sheet of charge that has uniform surface charge density 3.40 times 10^-12 C/m^2. How much work is done on the electron by the electric field of the sheet as the electron moves from its initial position to a point 4.00 times 10^-2 m from the sheet? Express your answer to three significant figures and include the appropriate units. What is the speed of the electron when it is 4.00 times 10^-2 m from the sheet? Express your answer to three significant figures and include the appropriate units.

Explanation / Answer

partA] work done = Force*displacement

= qE* d = q*(sigma/2e0) *d

= 1.6e-19* 3.4e-12/(2*8.85e-12) *(0.39-0.04)

= 1.08*10^-20 J

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