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ABCDEFGH is a hollow cube made of an in...

ABCDEFGH is a hollow cube made of an insulator (figure) face ABCD has positive charge on it. Inside the cube, we have ionised hydrogen.

A

will be valid

B

will not be valid, since the ions would experience forece other than due to collisions with the walls.

C

will not be valid since collisions with would not be elastic

D

will not be valid because isotropy is lost

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The correct Answer is:
2 and 4
Due to presence of external positive charge on the face ABCD. The usual expression for pressure on the basis of kinetic theory will not be valid as ions would also experience electrostatic forces other than the forces due to collisions with the walls of the container. Due to pressence of positive charge the isotropy is also lost.
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