Alexis is a scientist who is studying solid-state physics. Which activity would she most likely do as a part of this research? A) identifying the optimal vessel for containing carbon dioxide
B) studying the atomic structure of solid carbon dioxide
C) determining the effect of pressure on the volume of carbon dioxide
D) observing the natural state of carbon dioxide

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e