Question

Two points $P$ and $Q$ are maintained at the potentials of $10V$ and $-4V$, respectively. The work done in moving 100 electrons from $P$ to $Q$ is :

• A. $-9.60\times {10}^{-17}J$
• B. $9.60\times {10}^{-17}J$
• C. $-2.24\times {10}^{-16}J$
• D. $2.24\times {10}^{-16}J$

Answer 1

Answer: (D)

$2.24\times {10}^{-16}J$

$W=Q\Delta V=Q(V_q-V_p)$
$W=100\times (-1.6\times {10}^{-19})\times (-14)$
$=2.24\times {10}^{-16}$ J