Answer:
The answer to your question is the letter B. A repulsive force of 8.0 x 10³N
Explanation:
Data
Charge 1 = -2.0 x 10² C
Charge 2 = -4.0 x 10⁻⁸ C
K (Coulomb constant) = 9 x 10⁹ Nm²/C²
distance = 3 m
Formula
F = K (q₁ x q₂) / r²
Substitution
F = 9 x 10⁹ (-2.0 x 10²)(-4.0 x 10⁻⁸) / 3²
Simplification
F = 9 x 10⁹ (0.000008) / 9
F = 72000 / 9
Result
F = 8000 C = 8 x 10³ N
Conclusion
As both spheres are negative the force is negative with magnitude 8x 10³N
