A rubber balloon possesses a positive charge. If brought near and touched to a wooden door, it sticks to the door. This does not occur with an uncharged balloon. The wooden door must be:

I know that it must be neutral, but I don't get why a negative/positive door cannot induce a charge in a neutral balloon? Why can the electrons in the balloon not move to create temporary dipole? Please explain these concepts to me not just tell me the answer.