Exercise $21\mathrm{.}27-$ Enhanced $-$ with Solution

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Review

Constants

Part A

An electron is projected with an initial speed $v_0=1\mathrm{.}10{10}^6\frac{m}{s}$ into the uniform field between the parallel plates in $($Figure $1).$ Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the plates is zero. The electron enters the field at a point midway between the plates.

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If the electron just misses the upper plate as it emerges from the field, find the magnitude of the electric field.

Express your answer in newtons per coulomb.

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Part B

Suppose that in the figure the electron is replaced by a proton with the same initial speed $v_0.$ Would the proton hit one of the plates?

yes

no