Coulomb's Law: a 1

Multiple Choice

Coulomb's law: A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/4πε₀ = 8.99 × 10⁹ N ∙ m²/C²)

A) 25 C
B) 1.0 C
C) 10 nC
D) 0.025 C
E) 25 nC