Q. An electron enters between two horizontal plates separated by $2mm$ and having a potential difference of $1000V.$ The force on electron is
A) $8 \times 10^{- 12}N$
B) $8 \times 10^{- 14}N$
C) $8 \times 10^{9}N$
D) $8 \times 10^{14}N$
Explanation
(b) Force on electron $F = QE = Q\left( \frac{V}{d} \right)$
$\Rightarrow F = \left( 1.6 \times 10^{- 19} \right)\left( \frac{1000}{2 \times 10^{- 3}} \right) = 8 \times 10^{- 14}N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.