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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 forces other than due to collisions with the walls.

C

will not be valid since collisions with walls would not be elastic.

D

will not be valid because isotropy is lost.

Text Solution

Verified by Experts

The correct Answer is:
B, D
As face ABCD has positive charge on it and the gas consists of ironzed hydrogen, therefore, isotorpy is lost. The usual expression for pressure on the basis of kinetic theory will not be valid would also experience forces other than the force due to collison with the walls of the container. Choices (b) and (d) are correct.
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Knowledge Check

  • ABCDEFGH is a hollw cube made of an insulator(figure) face ABCD has positive charges on it. Inside the cube, we have ionsed hydrogen. The usual kinetic theory expression for pressure

    A
    will be valid
    B
    will not be valid, since the ions would experience force other than due to collision with the walls
    C
    will not be valid, since collision with walls would not be elastic
    D
    will not be valid because isotropy is lost

  • Consider a solid cube made up of insulating material having a uniform volume charge density. Assuming the electrostatic potential to be zero at infinity, the ratio of the potential at a corner of the cube to that at the centre will be

    A
    `1:1`
    B
    `1:2`
    C
    `1:4`
    D
    `1:8`

  • A cube is made from six thin insulating square faces, each square having side 'd' and carrying a uniformly distributed charge of Q. The magnitude of electric flux leaving the sixth face, due to the electric field of other five faces, is varphi . The magnitude of electrostatic force on each face of cube is F. Then,

    A
    `varphi = (5Q)/(6E_0)`
    B
    `varphi = (Q)/(2E_0)`
    C
    `F = (2Q^(2))/(E_(0)d^(2))`
    D
    `F = (Q^(2))/(E_(0)d^(2))`