Plot a graph showing variation of de Broglie wavelength $\left(\mathit{\lambda }\right)$ associated with a charged particle of mass $\mathit{m}$, versus $\frac{1}{\sqrt{\mathit{V}}}$, where $\mathit{V}$ is the potential difference through which the particle is accelerated. How does this graph give us the information regarding the magnitude of the charge of the particles?