Suppose you have two negative point charges. As you move them farther and farther apart, the potential energy of this system relative to infinity is: a. decreases b. increases c. stays the same

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.

Explain why electric current cannot exist if a current doesn't have a voltage source.

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery