Two identical steel balls mounted on wooden posts initially have different amounts of charge, one +31x10⁻⁶C and the other -7x10⁻⁶C. The balls are allowed to touch and then are separated again. What is the final charge on each ball?
A) +12x10⁻⁶C, -12x10⁻⁶C
B) +24x10⁻⁶C, -24x10⁻⁶C
C) +17x10⁻⁶C, -17x10⁻⁶C
D) +10x10⁻⁶C, -10x10⁻⁶C