a) Three pithballs are suspended from thin threads.Various objects are then rubbed against other(adsbygoogle = window.adsbygoogle || []).push({});

objects (nylon against silk, glass against polyester, etc.) and each of the pithballs is charged by

touching them with one of these objects. It is found that pithballs 1 and 2 attract each other and

that pithballs 2 and 3 repel each other. From this we can conclude that:

1. 1 and 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 .

^so i know opposite charges attract and negative charges repel

i chose 1 and 5 to be correct choices because I imagine the sequence of charges to be:

+ - - or - + +

is there a possible way to determine the sign of the charges?

I'd like to be reassured or told what is wrong with my reasoning

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Three pithballs are suspended from thin threads

**Physics Forums | Science Articles, Homework Help, Discussion**