Question

Calculate the intensity of electric field at a point 4mm away from an alpha particles?

Answer 1

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Charge on α-particle = q = 2e = 2×1.6×10⁻¹⁹ = 3.2×10⁻¹⁹ C

Distance from α-particle = 4mm = 4×10⁻³ m

Hence,

Electric field intensity = E = kq/r²

E = 9×10⁹×3.2×10⁻¹⁹/4×10⁻³

E = 9×0.8×10⁹⁻¹⁹⁺³

E = 7.2×10⁻⁷ N/C

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