Three small spherical insulators are suspended from thin spread. It is found that insulators 1 and 2 repel each other and that insulator 2 and three repel each other. Which statement must be true. 1. All insulators have charges of different sign. 2. 1 and 2 carry charges of opposite sign. 3. 2 and three carry charges of opposite sign. 4. One of the insulators carry no charge. 5. None of the above.

2 what statement could be true?

1. 1 and 2 carry charges of opposite sign. 2. 2 and 3 carry charges of opposite sign. 4. One of the insulators carry no charge. 5. All insulators have charges of different sign.

6. None of the above