A pair of charged parallel plates are 2.0 cm apart and there is a potential difference of 5.0 kV across the plates.

A charged ion between the plates experiences a force of 1.2 × 10⁻¹³ N due to the field.

What is the charge on the ion?
A. 1.6 × 10⁻¹⁹ C
B. 4.8 × 10⁻¹⁹ C
C. 2.5 × 10⁻¹⁵ C
D. 4.0 × 10⁻⁶ C