Question: (a) For the electron in Examples 21.7 and 21.8, compare the weight of the electron to the magnitude of the electric force on the electron.

(a) For the electron in Examples 21.7 and 21.8, compare the weight of the electron to the magnitude of the electric force on the electron. Is it appropriate to ignore the gravitational force on the electron in these examples? Explain.
(b) A particle with charge + e is placed at rest between the charged plates in Fig. 21.20. What must the mass of this object be if it is to remain at rest? Give your answer in kilograms and in multiples of the electron mass.
(c) Does the answer to part (b) depend on where between the plates the object is placed? Why or why not?

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