# Homework Help: Properties of neutral charges?

1. Aug 19, 2013

### kickthatbike

Three objects (A, B, and C) are brought close to each other one at a time. A and B attract, but B and C repel. Simple true/false question involving "is this one positive/negative/etc." What I'm unsure about is whether or not A could possibly be neutral, or more specifically, is there any way to tell with certainty based on the limited information whether or not it IS neutral?

2. Aug 19, 2013

### SteamKing

Staff Emeritus
There are no neutral charges, only positive and negative charges. A neutral particle is neither attracted to nor repulsed by a charged particle.

3. Aug 19, 2013

### kickthatbike

Fair enough. Thank you!

4. Aug 20, 2013

### ehild

A charged object can attract neutral ones by polarizing them. A rubbed plastic rod (or a simple comb) will attract small and light paper pieces. See: http://www.physicsclassroom.com/class/estatics/u8l1c.cfm (experiment with a rubbed balloon and bits of paper). So you are right, A can be neutral, too.