The force between two point charges is Coulomb's force:
F=kr2∣q1∣∣q2∣ where q1=5μC=5×10−6C, q2=10μC=10×10−6C are point charges, k=9×109N⋅m2/C2 is the Coulomb's constant, and r=0.2m is the distance between the charges. Substituting these numbers, obtain:
F=9×1090.22∣5×10−6∣∣10×10−6∣=11.25N Answer. 11.25 N.
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