Balls 1, 2, 3, and 4 are hanging by strings. A plastic rod, which has been rubbed with wool, is used to touch Ball 1. When the balls are brought near each other, but not touching, the following is observed: • Ball 2 is attracted to ball 3 • Balls 2 and 4 do not affect one another • Balls 2, 3, and 4 are attracted to ball 1
What is ball 1's charge state?
Glass
Neutral
Plastic
Question 2
The leaves of an electroscope that is negatively charged are separated. What will happen to the separation between the leaves if you brought a positively charged rod near, but without touching, the top of the electroscope?
It will become smaller.
It will remain the same.
It will become larger.
Question 3
The metal spheres, A and B, are initially neutral and are touching. A positively charged rod is brought near sphere A, but does not come in contact with it. While the rod is still near, the spheres are separated slightly so they are no longer touching. The charged rod is then removed. What is now the charge of sphere B ?
Positive.
Neutral.
Negative.
Question 4
Two charged spheres are placed as shown above. The size of the sphere represents how much charge it has. Choose the position (indicated by A, B, C, or D) where there would be zero net force on an electron.
A
B
C
D