Answer:
Correct answer: Fc = 95.6 N
Explanation:
Fc = k q₁ q₂ / r² Coulomb force
where it was given:
k = 9 · 10⁹ N m²/C² dielectric constant,
q₁ = - 72 μC = - 72 · 10⁻⁶ C
q₂ = + 83 μC = + 83 · 10⁻⁶ C
r = 0.75 m = 75 · 10⁻² m distance between charges
Since the given charges are opposite between them exist force of attraction.
Fc = k q₁ q₂ / r² = 9· 10⁹ · 72 · 10⁻⁶ · 83 · 10⁻⁶ / (75 · 10⁻²)²
Fc = 53,784 · 10⁻³/ 5,625 · 10⁻⁴ = 9.56 · 10⁻³ · 10⁴ = 9.56 · 10 = 95.6 N
Fc = 95.6 N
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