What is the electric force between a 2 microcoulomb point charge and a -2 microcoulomb point charge if they are separated by a distance of 5.0 cm? Show your work.
a) -7.2 × 10⁻² N
b) 7.2 × 10⁻² N
c) -3.6 × 10⁻² N
d) 3.6 × 10⁻² N