Question

Three Styrofoam balls are suspended from thin threads. Various objects are then rubbed against each other (wool against plastic, silk against glass, etc...) and each Styrofoam ball is charged by toughing. It is found that balls 1 and 2 repel each other and that balls 2 and 3 attract each other.

From this we can conclude (check all that apply).

2 and 3 carry charges of the same sign

we need more information to determine the sign of the net charge on each ball

1 and 3 carry charges of the opposite sign

all three objects carry charges of the same sign

1 and 2 carry charges of the same sign

1 and 2 carry charges of the opposite sign

2 and 3 carry charges of the opposite sign

1 and 3 carry charges of the same sign

Answer 1