ABCDEFGH is a hollow cube made of an insulator (Fig. 13.4). Face ABCD has positive charge on it. Inside the cube, we have ionized hydrogen. The usual kinetic theory expression for pressure

Question

Philoid · Accepted Answer

Here face ABCD has positive charge on it and inside the cube has ionized hydrogen. Due to the presence of positive charge on the face the hydrogen ions will experience forces other than the force due to collision on the walls of the cube. These forces must be electrostatic in nature and isotropy is lost at ABCD due to positive charge .Therefore, the usual kinetic theory expression for pressure is not valid.