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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

$\begin {array} {1 1} (A)\;-19 \times 10^{-17}J & \quad (B)\;9.6 \times 10^{-17}J \\ (C)\;-2.24 \times 10^{-16}J & \quad (D)\;2.24 \times 10^{-16}J \end {array}$

Can you answer this question?

$W = QdV = -100 \times 10^{-16} (-4\: -10) = 2.24 \times 10^{-16}$
Ans : (D)
answered Feb 13, 2014
edited Mar 14, 2014