Question

In an isolated vacuum, positively charged metal cube X is brought into contact with positively charged metal cube Y. According to the principle of conservation of charge, which of the following claims is correct after the cubes have been in contact for a very long time?

The system of cube X is an open system. A)

The system of cube Y is an open system. B)

The system of cube X and cube Y is an open system. C)

Answer 1

Isolated system means when there is no interaction between this system and surroundings.

Open system means when there is interaction between this system and surroundings.

Now, As Cube X and Cube Y are placed in contact, there can be some flow of charge due to potential difference, due to which charge of one cube increases and while that of other decreases, but total charge of (cube X + cube Y) will remain constant.

So, there is an interaction between cube X and cube Y.

hence, Cube X is an open system.

cube Y is also an open system.

(cube X + cube Y) isolated system.