Explain why a charged comb picks dry small pieces paper but does not when wetted?

When a comb is charged, it creates an electric field around it. This electric field can attract small pieces of paper because the paper becomes polarized in the presence of the charged comb, causing it to be attracted to the comb.

When the paper is wet, it becomes conductive and the water molecules disrupt the polarization of the paper. This means that the paper is no longer attracted to the charged comb because the electric field is not able to polarize the wet paper in the same way as dry paper. Therefore, the charged comb is not able to pick up wet pieces of paper.

When a comb is charged, it creates an electric field around it. This electric field can attract small pieces of paper that are not grounded. When the comb is wetted, the water molecules on the comb will conduct electricity away from the comb. This will reduce the strength of the electric field around the comb, and the comb will no longer be able to attract the pieces of paper.