Question

Three pithballs are suspended from thin threads. Various objects are then rubbed against other objects (nylon against silk, glass against polyester, etc.) and each of the pithballs is charged by touching them with one of these objects. In one set of experiments, it is found that pithballs 1 and 2 repel each other and that pithballs 2 and 3 repel each other. From this we can conclude that ? all three carry the charges of the same sign ? one of the objects carries no charge. ? 1 and 3 carry charges of equal sign and opposite to the sign of 2 ? 1 and 3 carry charges of opposite sign. ? all charges are positive.

          Three pithballs are suspended from thin threads. Various objects are then rubbed against other objects (nylon against silk, glass against polyester, etc.) and each of the pithballs is charged by touching them with one of these objects. In one set of experiments, it is found that pithballs 1 and 2 repel each other and that pithballs 2 and 3 repel each other. From this we can conclude that

? all three carry the charges of the same sign

? one of the objects carries no charge.

? 1 and 3 carry charges of equal sign and opposite to the sign of 2

? 1 and 3 carry charges of opposite sign.

? all charges are positive.

Three pithballs are suspended from thin threads. Various objects are then rubbed against other objects (nylon against silk, glass against polyester, etc.) and each of the pithballs is charged by touching them with one of these objects. In one set of experiments, it is found that pithballs 1 and 2 repel each other and that pithballs 2 and 3 repel each other. From this we can conclude that

? all three carry the charges of the same sign

? one of the objects carries no charge.

? 1 and 3 carry charges of equal sign and opposite to the sign of 2

? 1 and 3 carry charges of opposite sign.

? all charges are positive.

Added by Javier W.

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