Two insulating plates are both uniformly charged in such a way that the potential difference between them is ${\mathrm{V}}_2-{\mathrm{V}}_1=20\mathrm{V}$. (i.e. ,plate 2 is at a higher potential). The plates are separated by d = 0. 1 m and can be treated as infinitely large. An electron is released from rest on the inner surface of plate 1. What is its speed when it hits plate 2? $\left(\mathrm{e}=1.6 \mathrm{x} {10}^{-19}\mathrm{C}, {\mathrm{m}}_0=9.11 \mathrm{x} {10}^{-31}\mathrm{kg}\right)$

• A

  $2.65 \mathrm{x} {10}^6 \mathrm{m}/\mathrm{s}$

• B

  $7.02 \mathrm{x} {10}^{12} \mathrm{m}/\mathrm{s}$

• C

  $1.87 \mathrm{x} {10}^6 \mathrm{m}/\mathrm{s}$

• D

  $32 \mathrm{x} {10}^{-19} \mathrm{m}/\mathrm{s}$