Question

The potential difference between two parallel plates is $ {{10}^{4}}V $ . If the plates are separated by 0.5 cm, the force on an electron between the plates is

• A. $ 32\times {{10}^{-13}}N $
• B. $ 0.32\times {{10}^{-13}}N $
• C. $ 0.032\times {{10}^{-13}}N $
• D. $ 3.2\times {{10}^{-13}}N $

Answer 1

Answer: (D)

The force $ F=\frac{eV}{d} $ $ =\frac{1.6\times {{10}^{-19}}\times {{10}^{4}}}{0.5\times {{10}^{-2}}}=3.2\times {{10}^{-13}}N $