i'm working through a homework problem. it has us jump through a few hoops. the premise is that a bunch of electrons are injected into a block of lucite (relative permittivity is supplied). the electrons are all concentrated in a given volume within the block. it asks us for the volume bound charge density in the region of electrons (i'm assuming it is 0, since the electron density is uniform). then asks us for the bound surface charge density on the block (i calculated the free surface charge density at the interface between the region of electrons, then the bound surface charge density in the electron-free region from there). anyways, the last part of the question is: "What is the energy stored in the block? Could the block explode?" I'm lost at how to determine this. does anyone have any hints on the physics involved in determining when a dielectric will explode? thanks in advance.