Three pithballs are suspended from thin threads. Various objects are then rubbed

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 these objects. 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:

a- At least one of the pithballs must have negative charge.
b - Pithballs 1 and 3 carry charges of opposite sign
c- We need to do more experiments to determine the sign of the charges.
d - One of the pithballs carries no charge.
e -All three pithballs carry charges of equal sign.

Explanation / Answer

   1 and 2 repel each other, i.e. 1 and 2 has same type of charge.    2 and 3 repel each other, i.e. 2 and 3 has same type of charge.    Therefore 1 and 3 has same type of charge.       e -All three pithballs carry charges of equal sign.     

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