7. Now reset the balloon. Again, collect the blue negative charges from the sweater, by rubbing the balloon on the sweater. Even bring the balloon close to the wall again. What do you notice about the movement of the negative charges in comparison to the positive charges? Explain why.
When resetting the balloon, the negative charges from the sweater are collected again by rubbing the balloon on it. However, when the balloon is brought close to the wall this time, you will notice that the movement of the negative charges is different from that of the positive charges.
The negative charges on the balloon, unlike the positive charges, will be repelled by the negative charges on the wall. This is because like charges repel each other. Therefore, when the negatively charged balloon is brought close to the negatively charged wall, the negative charges on the balloon will move away from the wall, resulting in a repulsive force between them. On the other hand, the positive charges on the balloon will still be attracted to the negatively charged wall and move towards it.
So, in comparison to the positive charges, the negative charges experience a repulsion when brought close to the wall. The movement of the negative charges is dominated by this repulsion, leading to a different behavior compared to the positive charges.