The true statement about electrical charges is:
Opposite charges attract one another.
To clarify:
- Like charges (e.g., two positive charges or two negative charges) repel each other.
- Opposite charges (e.g., one positive charge and one negative charge) attract each other.
- The statement "Like charges and opposite charges have no effect on one another" is also false.
- The statement "Opposite electrical charges repel one another" is false.
So, the correct answer is: Opposite charges attract one another.