Tại hai điểm A và B cách nhau 20 cm trong không khí, đặt hai điện tích q1 = -3.10⁻⁶C. q2= 8.10⁻⁶C. Xác định lực điện do hai điện tích này tác dụng lên q3= 2.10⁻⁶C đặt tại C. Biết AC =12cm; BC= 16cm BC= 16 cm

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Đáp án:

$F=6,76(N)$

Giải thích các bước giải:

Lực tương tác do `q_{1}` tác dụng lên `q_{3}` là:

`F_{13}=k.\frac{|q_{1}.q_{3}|}{r^{2}}`

`=>F_{13}=9.10^{9}.\frac{|-3.10^{-6}.2.10^{-6}|}{0,12^{2}}`

`=>`$F_{13}=3,75(N)$

Lực tương tác do `q_{2}` tác dụng lên `q_{3}` là:

`F_{23}=k.\frac{|q_{2}.q_{3}|}{r^{2}}`

`=>F_{23}=9.10^{9}.\frac{|8.10^{-6}.2.10^{-6}|}{0,16^{2}}`

`=>`$F_{23}=5,625(N)$

`∆ABC` vuông tại `C`

Vì `\vec{F_{13}}` vuông góc với `\vec{F_{23}}` nên:

$F=\sqrt{F_{1}^{2}+F_{2}^{2}}=\sqrt{3,75^{2}+5,625^{2}}=6,76(N)$

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