Which Charge is Negative in an Electric Field Diagram?

[damu123]

Homework Statement

We are given a picture like the one I attached, in the question we are told that ATLEAST 2 are positive which one (if any) is negative
a) Only A
b) Only B
c) Only C
d) None of them

Homework Equations

None really all you need to know is that when the lines are pointing away from a charge its positive and if its going in that means its positive (but it really doesn't make much sense in this picture to me)

The Attempt at a Solution

I said that none of them are negative because A is def. not negative and B and C are the same so I assumed that they are all positive although it doesn't really make sense to me how B and C can be negative if arrows are going towards them (unless its like a vector diagram and we can move it from going into going out the other side of it which kindof makes sense but hard to explain)

 

[supratim1]

i think only A is positive, and it doesn't go with atleast 2 positive.

 

[tiny-tim]

welcome to pf!

hi damu123! welcome to pf!

… when the lines are pointing away from a charge its positive and if its going in that means its positive (but it really doesn't make much sense in this picture to me)

no …

the lines going inward means the two charges are attracting each other,

the lines going outward means the two charges are repelling each other …

sooo … ? ​

 

[damu123]

http://library.thinkquest.org/10796/ch12/ch12.htm
On section 2 it says what I said

I probably explained it incorrectly