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Statement of a problem № 3685

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An electron of mass me = 9.1x10^(-31) kg is accelerated in the uniform electric field E between two parallel charged plates, as shown in Fig. 11.9. There is no electric field outside of the plates. The electric field has a magnitude E = 2.0x10^3 N/C and electron charge e = -1.6x10^(-19) C. The separation of the plates is 1.5 cm and the electron is accelerated from rest near the negative plate and passes through a tiny hole in the positive plate. Assume the hole is so small that it does not affect the uniform field between the plates. (i) What is the force on the electron while it is between the plates? (ii) What is its acceleration and with what speed does it leave the hole? (iii) What is the force on the electron outside of the plates?

Solution:
An electron of mass me = 9.1x10^(-31) kg is accelerated in the uniform electric

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