Five small identical metal balls are hung from insulating silk threads and are h

Question

Five small identical metal balls are hung from insulating silk threads and are handled only by the threads. They are not allowed to touch one another during the following experiment. It has previously been found that none of the balls are affected by a magnet. The balls are brought near each other, and the following observations are recorded: 1. Metal balls II and IV exert no force on each other. 2. Metal balls III and I repel each other. 3. All other pairs of metal balls attract one another. For example, ball III attracts balls II, V, and IV.

In which pairs of balls do both carry charge of the same sign? Determine for each of the following statements whether it is correct or incorrect.
III and II

I and IV;

III and IV;

III and I;

II and V;

Which of the following pairs contain one ball of each charge? Determine whether each statement is correct or incorrect.

II and V;

III and II;

III and V;

V and IV;

II and I;

Explanation / Answer

1. Since I and III exert no force they have no charge

2. IV and V repel means IV and V are the same, lets say +

3. this means all others are -

so

I 0, II -, III 0, IV, +, V +

so a)

False
false
false
true
false

b)

true
false
false
false
false

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