Question

q₁ has a charge of 3.00×10 ⁻⁶ C and is 5.78 mm away from a second charge q₂​ . If the force between the charges is 18.9 N, what is the charge of q₂ ?
a. 2.34×10⁻⁸ C
b. 2.34×10 ⁻⁴ C
c. 7.00×10 ⁻⁸ C
d. 7.00×10 ⁻⁴ C