Q. Two points P and $\mathcal{Q}$ are maintained at the potentials of 10V and -4V respectively. The work done in moving 100 electrons from P to $\mathcal{Q}$ is
A) $- 19 \times 10^{- 17}J$
B) $9.60 \times 10^{- 17}J$
C) $- 2.24 \times 10^{- 16}J$
D) $2.24 \times 10^{- 16}J$
Explanation
(d) $W = \mathcal{Q\ }dV = \mathcal{Q}\left( V_{q} - V_{p} \right)$
$= - 100 \times \left( 1.6 \times 10^{- 19} \right) \times ( - 4 - 10)$
$= + 100 \times 1.6 \times 10^{- 19} \times 14$
$= + 2.24 \times 10^{- 16}J$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.