Question

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

The correct option is D $3.2\times {10}^{-13}N$

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