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  4. How much kinetic energy will be gained by an α -particle in going from a point at 70 V to another point at 50 V ?

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Q. How much kinetic energy will be gained by an $\alpha$ -particle in going from a point at $70\, V$ to another point at $50\, V$ ?

Electrostatic Potential and Capacitance

Solution:

$K E=q\left(V_{1}-V_{2}\right)$
$=2 \times 1.6 \times 10^{-19} \times(70-50)$
$=40\, eV$