Problem 7 Five small identical metal balls are hung from insulating silk threads
ID: 2281801 • Letter: P
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 III and IV exert no force on each other. 2. Metal balls V and I repel each other. 3. All other pairs of metal balls attract one another. For example, ball V attracts balls III, II, and IV. a) In which pairs of balls do both carry charge of the same sign? (select True or False) V and III III and II V and IV I and IV V and I Which of the following pairs contain one ball of each charge? (Select True or False) II and IV lll and II V and ll V and I V and IVExplanation / Answer
(a) We know only same charge repel each other. So if V and I repel each other then they carry charge of same sign.
F,F,F,F,T is the correct sequence
(b) III and IV exert no force on each other.So they are neutral.V attracts II.So they carry opposite charges.
F,F,T,F,F