Answer:
here there is also an electric attraction force
Explanation:
In the insulating bodies the charges are not mobile, so when one of the body is charged periodically or gained some electrical charges.
When the body is neutral the net number of electric charges is zero. When the loaded body touches it, it repels the charges of the same sign whereby the induced load is of a different sign and the two adhered sheets are attracted.
With this explanation it is equivalent to that of the ball and the wall, so here there is also an electric attraction force