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q1 = +3μC = 3x10⁻⁶
q2 = -4μC = -4x10⁻⁶
r1 = 10 cm = 10⁻¹m
r2 = 40 cm = 10⁻¹m
dit : F1 dan F2 ?
dijawab :
F1 = k x (q1xq2)/r²
= 9x10⁹ (3x10⁻⁶ x -4x10⁻⁶) / (10⁻¹)²
= 9x10⁹ (-12x10⁻¹²)/10⁻²
= 9x10⁹ x -12x10⁻¹°
= -108x10⁻¹
= -10,8 N
F2= k x (q1xq2)/r²
= 9x10⁹ (3x10⁻⁶ x -4x10⁻⁶) / (4x10⁻¹)²
= 9x10⁹ (-12x10⁻¹²)/(4x10⁻²)
= 9x10⁹ x -3x10⁻¹°
= -27x10⁻¹
= -2,7 N
Q₂ = -4 μC = -4 x 10⁻⁶ C
r₁ = 10 cm = 10 x 10⁻²
r₂ = 40 cm = 40 x 10⁻²
F Jika menggunakan r₁
F Jika mengguankan r₂