H2P-398

Field of a point charge

H2 Physics · JC 2 · Hard · Field of a point charge

An electron moves horizontally at constant speed of

6.0\times10^6\,\text{m s}^{-1}

into a region between two parallel plates 0.20 m long and 0.040 m apart. The upper plate is at +80 V and the lower plate at −80 V. What is the magnitude of the vertical acceleration of the electron while it is between the plates? (Charge of electron

=1.6\times10^{-19}\,\text{C}

, mass

=9.11\times10^{-31}\,\text{kg}

$7.0\times10^{14}\,\text{m s}^{-2}$
$3.5\times10^{14}\,\text{m s}^{-2}$
$1.8\times10^{15}\,\text{m s}^{-2}$
$4.0\times10^{13}\,\text{m s}^{-2}$

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