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q = 5 C
r = 10 cm = 1.10⁻¹ m
k = 9.10⁹ Nm²/C²
Dit: E.....?
E = k q/r²
E = 9.10⁹ x 5 / (1.10⁻¹)²
E = 45.10⁹/1.10⁻²
E = 45.10¹¹ N/C
R =1 cm = 0,1 m
E = ?
E = k q/R²
E = 9x10⁹ x 5/0,1²
E = 45 x10¹¹ N/C