The wall becomes temporarily positively charged in response to the negatively charged balloon, but this charge distribution is not permanent, leading to the eventual fall of the balloon. When Marty rubs a balloon on his shirt, the balloon becomes negatively charged due to the transfer of electrons. The wall, initially neutral, becomes temporarily positively charged as positive charges are attracted to the negatively charged balloon. The balloon eventually falls as the charges dissipate through various mechanisms.
When Marty rubs the balloon on his shirt, the friction causes the balloon to gain electrons, giving it a negative charge. The shirt, in turn, loses electrons and becomes positively charged. When the negatively charged balloon is brought close to the neutral wall, it induces a temporary separation of charges in the wall. The positive charges in the wall are attracted to the negatively charged balloon, creating an electrostatic attraction.
However, this attraction is temporary. The charges on the wall are not fixed, and the wall is not permanently positively charged. The charges on the wall redistribute as the electrons in the wall move to neutralize the positive charge induced by the balloon. This redistribution of charges leads to the eventual fall of the balloon.
The dissipation of charges can occur through mechanisms like grounding or through the conductivity of the wall material. Once the charges are neutralized or redistributed, the electrostatic attraction weakens, and the balloon falls due to the influence of gravity.
The question probable may be:
Marty rubbed a balloon on his shirt. A balloon is negatively charged by rubbing and then clings to a wall. Does this mean that the wall is positively charged ? why does the balloon eventually fall?