A common demonstration involves charing a rubber balloon, which is an insulator,

Question

A common demonstration involves charing a rubber balloon, which is an insulator, by rubbing it on your hair, and touching the balloon to a ceiling or wall, which is also an insulator. The electrical attraction between the charged balloon and the neutral wall results in the balloon sticking to the wall. Imagine now that we have two infinitely large flat sheets of insulating material. One is charged and the other is neutral. If these are brought into contact, will an attractive force exit between them, as there was for the balloon and the wall?

Explanation / Answer

  
SOLUTION If the two insulating planes are brought close to each other , therewill be a force of attraction between them , because the charged sheet will induce opposite charges on the other sheet. However, if they are brought in contact with each other ,the charges will be nullified. Thus there will be no attractive force between them.

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