tina brings a positively charged glass rod near a very light, uncharged polystyrene ball.

what is the distribution of charges on the ball?
describe what happens to the polystyrene ball and why.

The distribution of charges on the polystyrene ball when Tina brings the positively charged glass rod near it would be as follows:

When the positively charged glass rod is brought near the uncharged polystyrene ball, the electrons in the polystyrene ball will be attracted to the glass rod due to the principle of electrostatics. As a result, some of the electrons in the polystyrene ball will move towards the end of the ball nearest to the glass rod, creating a slight negative charge in that region. At the same time, the area of the polystyrene ball farthest from the glass rod will have a slightly positive charge as some of the positive charges in the glass rod repel the positive charges in the polystyrene ball.

In other words, the charges on the polystyrene ball will redistribute themselves asymmetrically due to the presence of the charged glass rod, with one end becoming positively charged and the other end becoming negatively charged.

As for what happens to the polystyrene ball, it will experience an attractive force towards the positively charged glass rod. This happens because opposite charges attract each other according to the laws of electrostatics. The polystyrene ball will move towards the glass rod until it reaches an equilibrium position, where the attractive force is balanced by the repulsive force between the charges on the ball. The extent to which the ball moves towards the rod will depend on the strength of the charges and the distance between them.

In summary, when Tina brings a positively charged glass rod near an uncharged polystyrene ball, the charges on the ball redistribute themselves, resulting in a slightly negative charge on one end and a slightly positive charge on the other end. The ball then moves towards the glass rod due to the attractive force between the opposite charges.