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

Question

A common demonstration involves charging a rubber balloon, which is an insulator, by rubbing it on your hair and then touching the balloon to a ceiling or wall, which is also an insulator. Because of the electrical attraction between the charged balloon and the neutral wall, the balloon sticks 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 sheets are brought into contact, does an attractive force exist between them as there was for the balloon and the wall? Please explain in detail. A common demonstration involves charging a rubber balloon, which is an insulator, by rubbing it on your hair and then touching the balloon to a ceiling or wall, which is also an insulator. Because of the electrical attraction between the charged balloon and the neutral wall, the balloon sticks 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 sheets are brought into contact, does an attractive force exist between them as there was for the balloon and the wall? Please explain in detail.

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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