QUESTION $(1)$

ANSWER

If an object with charge $+2$ nC moves from a location that has a potential of $20$ V to a location with a potential of $-10$ V $,$ what has happened to the potential energy of the system?

The potential energy of the system has increased by $U=+(30V)(2nC).$

The potential energy of the system has decreased by $U=-(30V)(2nC).$

The potential energy of the system has decreased by $U=-(10V)(2nC).$

The potential energy of the system has increased by $U=+(10V)(2nC).$

IDON'T KNOWYET