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  4. The electrostatic potential energy between proton and α - particle separated by a distance 2A is:

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Q. The electrostatic potential energy between proton and $\alpha$ - particle separated by a distance $2A$ is:

Electrostatic Potential and Capacitance

Solution:

$P . E=\frac{k q_{1} q_{2}}{r}$
$\Rightarrow P . E=\frac{9 \times 10^{9} \times 1.6 \times 10^{-19} \times 2 \times 1.6 \times 10^{-19}}{2 \times 10^{-10}}$
$P . E=\frac{4.8 \times 9}{2} \times 10^{-19}$
$=21.6 \times 10^{-19} J$
$ \simeq 2.2 \times 10^{-18} J$