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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

(1) $40\text{\hspace{0.17em}}eV$

(2) $40\text{\hspace{0.17em}}keV$

(3) $40MeV$

(4) $0\text{\hspace{0.17em}}eV$