Two fixed particles, each of charge 5.0 × 10⁻⁶ C, are 24 cm apart. What force do they exert on a third particle of charge -2.5 × 10⁻⁶ C that is 13 cm from each of them?
a) 4.17 × 10⁻² N
b) 6.25 × 10⁻² N
c) 1.04 × 10⁻¹ N
d) 1.56 × 10⁻¹ N