Two points $P$ and $Q$ are maintained at the potentials of $10\ V$ and $- 4\ V$, respectively. The work done in moving $100$ electrons from $P$ to $Q$ is
AIEEE 2009, Easy
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$\frac{W_{P Q}}{q}=\left(V_{Q}-V_{P}\right)$
$\Rightarrow W_{P Q}=q\left(V_{Q}-V_{P}\right)$
$=\left(-100 \times 1.6 \times 10^{-19}\right)(-4-10)$
$=+2.24 \times 10^{-16} \,\mathrm{J}$
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