Problem 7 Five small identical metal balls are hung from insulating silk threads

Question

Problem 7 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 I and III exert no force on each other. 2. Metal balls IV and V repel each other. 3. All other pairs of metal balls attract one another. For example, ball IV attracts balls I, H, and III. a) In which pairs of balls do both carry charge of the same sign? (select True or False) Which of the following pairs contain one ball of each charge? (Select True or False)

Explanation / Answer

Lets go through the information once at a time

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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