Three balls are suspended from thin threads. Various objects are then rubbed aga

Question

Three balls are suspended from thin threads. Various objects are then rubbed against other objects (nylon against silk, glass against polyester, glass against glass, etc.) and each of the balls is touched with one of these objects. 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 that... 1)1and 3 carry charges of opposite sign. 2) 1 and 3 carry charges of equal sign. 3) all three carry the charges of the same sign. 4) one of the objects carries no charge. 5) we need to do more experiments to determine the sign of the charges. Write the number and explain.

Explanation / Answer

Charges of equal sign repel, so 1 and 2 carry charges of equal sign and so, too, do 2 and 3. Attraction between 1 and 2 could be due to opposite charge, or due to induction

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