A particle has a mass $400$ times than that of the electron and charge is double than that of a electron. It is accelerated by $5\,V$ of potential difference. Initially the particle was at rest, then its final kinetic energy will be......$eV$
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(b) $\Delta E = 2e \times 5V = 10\,eV$ $==>$ Final kinetic energy $ = 10\,eV$
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