Charge question A, B, C Explanation

[flyingpig]

Homework Statement

Three objects are brought together, two at a time. A is brought near B and they repel. B is then brought to C and they repel. Which of the following is true?

a)A and C have the same sign
b) A and C have opposite sign
c)A, B, and C have the same sign
d)One of them is neutral
e)Need additional experiment to determine the signs

I picked c) and it says it is a), why?

 

[Doc Al]

Both answers are correct. What book are you using?

 

[flyingpig]

Serway and Jewett

EDIT: never mind, the question asked what ARE true, not IS...

It says a, c, e (e looked smudged so I couldn't see it)

 

[Doc Al]

Serway and Jewett

What edition and what problem?

 

[flyingpig]

I think it's the 8th edition, it's just one of those quick quizzes