Q. If an electron moves from rest from a point at which potential is 50 volt to another point at which potential is 70 volt, then its kinetic energy in the final state will be
A) $3.2 \times 10^{- 10}\ J$
B) $3.2 \times 10^{- 18}\ J$
C) $1\ N$
D) $1\ dyne$
Explanation
(b) $K.E. = q_{0}\left( V_{A} - V_{B} \right) = 1.6 \times 10^{- 19}(70 - 50) = 3.2 \times 10^{- 18}\ J$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.