I need help with my lab report. I performed static electricity lab and need help

Question

I need help with my lab report. I performed static electricity lab and need help with answering the questions completely. I have bolded my answers, but I need explanation as to why that result have occured.

The electroscope is a device that can detect an excess of charge on an object. The electroscope can also store charge on its own. To see how it works, rub the wool cloth vigorously on the polyethylene strip to create an imbalance of charge on the rod. Then brush the polyethylene strip on the metal ball on the top of the electroscope, making sure to rub as much of the surface of the polyethylene on the metal ball as possible.

a.) What happens to the metal leaves inside the electroscope when the electroscope is charged? Why does this happen?
One of the metal leaves moves from the center to the right back and forth.

b.) What happens to the leaves of the electroscope after the Polyethylene is removed? Why does this happen?
One of the leaves remains separated and stays in that position.

c.) After the electroscope has been charged, bring the uncharged vinyl strip in contact with the metal ball on the top of the electroscope and describe what happens to the leaves.
The leaves still remained separated and thus no changes have occured.

d.) Now remove the vinyl and touch the metal rod to the electroscope in the same fashion and describe the results.
The leaves went back to the center position of the electroscope.

e.) Why were the results different when the vinyl was in contact with the electroscope and when the metal was in contact with the electroscope? Describe what happened to the charge on the electroscope in each case.

Explanation / Answer

a.) What happens to the metal leaves inside the electroscope when the electroscope is charged? Why does this happen?
Ans. when the electroscope is charged, both the leaves of the electroscope move away from each other. This happens as the charge on the electroscope ball moves to the leaves, and both leaves, on account of same charge repel each other and hence move away from each other

b. ) What happens to the leaves of the electroscope after the Polyethylene is removed? Why does this happen?
Ans. when the polyethylene is removed from contact of the electroscope, the electroscope gets some charge from the rod and both the leaves, on account of having the same charge move away from each other

c. ) After the electroscope has been charged, bring the uncharged vinyl strip in contact with the metal ball on the top of the electroscope and describe what happens to the leaves.
Ans. when uncharged objects which are insulators are bought in contact with the metal ball, there is no flow of charge and hence the electroscope still remains charged and the leves are away from each other

d. ) Now remove the vinyl and touch the metal rod to the electroscope in the same fashion and describe the results.
Ans. when the metal rod touches the electroscope metal ball, the electroscope discharges and the leaves come back to the original position as they are no longer charged

e. ) Why were the results different when the vinyl was in contact with the electroscope and when the metal was in contact with the electroscope? Describe what happened to the charge on the electroscope in each case.
Ans. The results were different as when a non conductor touches the m,etal sphere, there is no transfer of charge so nothing happens, while when conductoir touches the ball, the extra charge on the electroscope moves to the conductor and hence the electroscope leaves come back to their default position.

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